{
  "block": 106153263,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "7939.373350 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2026-05-18T08:27:57",
  "trx_id": "efd4fa00b41f6d16324cf46fed318e7b3eb9fe64",
  "trx_in_block": 0,
  "virtual_op": 0
}

{
  "block": 106015678,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "5227.162945 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2026-05-13T13:13:18",
  "trx_id": "50cab4bdb83e6aa826f095fb255407cefabbd415",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 105520686,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "7951.889106 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2026-04-26T07:36:33",
  "trx_id": "d30fef59f35df92d82c75925fe1e665d9cbcc1b6",
  "trx_in_block": 5,
  "virtual_op": 0
}

{
  "block": 102878266,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "5268.709764 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2026-01-24T05:53:36",
  "trx_id": "5a080fe3eb3a9af4498c7b748f99bd17d37ec82b",
  "trx_in_block": 0,
  "virtual_op": 0
}

{
  "block": 91324457,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "5432.928961 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2024-12-18T01:02:18",
  "trx_id": "55f33275b206a72ab7ff314d1552944a354932d6",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 79878561,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "5602.062493 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2023-11-14T16:41:39",
  "trx_id": "f813253166c0d63ef32b4651560099d1a382d514",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 78365956,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "8538.971279 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2023-09-22T12:58:30",
  "trx_id": "9f60b144dd6d453df36cfe78e7e370eadc7f3801",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 69123291,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "8761.022717 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2022-11-03T20:05:57",
  "trx_id": "9e9e8d002c25bf5ee47eeca95433f0921eaf42af",
  "trx_in_block": 0,
  "virtual_op": 0
}

{
  "block": 60826285,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "8981.130318 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2022-01-18T01:05:06",
  "trx_id": "2002b5d958a6ce0a092de369ceb9c51ee71d2edc",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 54616495,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "9165.324606 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2021-06-14T08:10:42",
  "trx_id": "84ed7832eda7efa2c535e0ecf363af0875b5bacf",
  "trx_in_block": 8,
  "virtual_op": 0
}

{
  "block": 49363687,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "9352.746580 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-12-11T18:20:45",
  "trx_id": "7e7f5552d0b299dc6268abf8759139a8fd65ef4e",
  "trx_in_block": 0,
  "virtual_op": 0
}

{
  "block": 49215198,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "1912.543513 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-12-06T11:55:39",
  "trx_id": "6d36fbdf388073e85a997d97ad580c017ebfe87c",
  "trx_in_block": 2,
  "virtual_op": 0
}

{
  "block": 49198767,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "9358.954434 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-12-05T21:58:24",
  "trx_id": "09184be886698724e1bad615be309c3d6356d88d",
  "trx_in_block": 4,
  "virtual_op": 0
}

{
  "block": 48275416,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "1920.017158 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-11-03T06:35:54",
  "trx_id": "84f5ff6eae8d94b1c636a69d490762c1699e8e65",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 43225558,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "9561.759793 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-05-09T13:00:45",
  "trx_id": "7baabb1a6587e458df5b70745098e00d2d511943",
  "trx_in_block": 11,
  "virtual_op": 0
}

{
  "block": 43202937,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "1953.311140 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-05-08T17:42:36",
  "trx_id": "c9f5fbded2e9eb3092f8ca83058b6a150ddac4ab",
  "trx_in_block": 3,
  "virtual_op": 0
}

{
  "block": 41388491,
  "op": [
    "comment",
    {
      "author": "steemitboard",
      "body": "Congratulations @yijunyu! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@yijunyu/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@yijunyu) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=yijunyu)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/use-your-witness-votes-and-get-the-community-badge\"><img src=\"https://steemitimages.com/64x128/https://cdn.steemitimages.com/DQmTugCUsoXX762vg1CuHRrpnPbfnjPogp8iCGv7F2kSVuj/image.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/use-your-witness-votes-and-get-the-community-badge\">Use your witness votes and get the Community Badge</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
      "json_metadata": "{\"image\":[\"https://steemitboard.com/img/notify.png\"]}",
      "parent_author": "yijunyu",
      "parent_permlink": "deep-learning-applied-to-deep-thoughts",
      "permlink": "steemitboard-notify-yijunyu-20200305t144459000z",
      "title": ""
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2020-03-05T14:45:00",
  "trx_id": "b4300c31ea87937b14e287b84d44363bd8d8de4b",
  "trx_in_block": 7,
  "virtual_op": 0
}

{
  "block": 33533735,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "9756.430337 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2019-06-05T12:54:42",
  "trx_id": "cccddcbb5fb23a860ff319ed5a7dcc03f8818ea5",
  "trx_in_block": 16,
  "virtual_op": 0
}

{
  "block": 30807119,
  "op": [
    "comment",
    {
      "author": "steemitboard",
      "body": "Congratulations @yijunyu! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@yijunyu/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_[Click here to view your Board](https://steemitboard.com/@yijunyu)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/carnival/@steemitboard/carnival-2019\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/rltzHT.png\"></a></td><td><a href=\"https://steemit.com/carnival/@steemitboard/carnival-2019\">Carnival Challenge - Collect badge and win 5 STEEM</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) and get one more award and increased upvotes!",
      "json_metadata": "{\"image\":[\"https://steemitboard.com/img/notify.png\"]}",
      "parent_author": "yijunyu",
      "parent_permlink": "deep-learning-applied-to-deep-thoughts",
      "permlink": "steemitboard-notify-yijunyu-20190302t175420000z",
      "title": ""
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2019-03-02T17:54:21",
  "trx_id": "dd177391f9a841b7534bc5782078be812bec0256",
  "trx_in_block": 7,
  "virtual_op": 0
}

{
  "block": 23262707,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "9955.672452 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-06-12T17:16:30",
  "trx_id": "0fe28a96a523d4e193b6e76a70c5f3dbba670a9a",
  "trx_in_block": 31,
  "virtual_op": 0
}

{
  "block": 20643619,
  "op": [
    "vote",
    {
      "author": "ethanlee",
      "permlink": "cn",
      "voter": "yijunyu",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-13T16:09:45",
  "trx_id": "64741fe7c2b513bd49cd61ddb87ed6aef5ad5c93",
  "trx_in_block": 67,
  "virtual_op": 0
}

{
  "block": 20533523,
  "op": [
    "author_reward",
    {
      "author": "yijunyu",
      "permlink": "deep-learning-applied-to-deep-thoughts",
      "sbd_payout": "0.309 SBD",
      "steem_payout": "0.000 STEEM",
      "vesting_payout": "228.715348 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-09T20:15:30",
  "trx_id": "0000000000000000000000000000000000000000",
  "trx_in_block": 4294967295,
  "virtual_op": 15
}

{
  "block": 20522929,
  "op": [
    "custom_json",
    {
      "id": "follow",
      "json": "[\"follow\",{\"follower\":\"yijunyu\",\"following\":\"ethanlee\",\"what\":[\"blog\"]}]",
      "required_auths": [],
      "required_posting_auths": [
        "yijunyu"
      ]
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-09T11:25:36",
  "trx_id": "c75f6aa95d643c5490379ca833afa40a33a658cd",
  "trx_in_block": 3,
  "virtual_op": 0
}

{
  "block": 20407220,
  "op": [
    "custom_json",
    {
      "id": "follow",
      "json": "[\"follow\",{\"follower\":\"yijunyu\",\"following\":\"zdyan\",\"what\":[\"blog\"]}]",
      "required_auths": [],
      "required_posting_auths": [
        "yijunyu"
      ]
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-05T10:52:21",
  "trx_id": "f9eed1e7e0e03c512d4fd8672af5a8aefc8cb961",
  "trx_in_block": 31,
  "virtual_op": 0
}

{
  "block": 20403004,
  "op": [
    "vote",
    {
      "author": "yijunyu",
      "permlink": "tips-for-locating-pokemon",
      "voter": "zdyan",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-05T07:21:33",
  "trx_id": "9bba8cae33d7a567d8328da0363f08455c499cf8",
  "trx_in_block": 35,
  "virtual_op": 0
}

{
  "block": 20391893,
  "op": [
    "comment",
    {
      "author": "resteembot",
      "body": "Resteemed by @resteembot! Good Luck!\nThe resteem was paid by @greetbot\nCurious? Read @resteembot's [introduction post](https://steemit.com/resteembot/@resteembot/how-to-use-resteembot-updated-2017824t202525149z)\nCheck out the great posts I already resteemed.\n\n[ResteemBot's Maker is Looking for Work.](https://steemit.com/resteembot/@resteembot/hire-me-i-ll-code-for-crypto)",
      "json_metadata": "",
      "parent_author": "yijunyu",
      "parent_permlink": "tips-for-locating-pokemon",
      "permlink": "re-yijunyu-tips-for-locating-pokemon-20180304t220546826z",
      "title": ""
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-04T22:05:48",
  "trx_id": "5e114bcb50e9fe2b40a8947b41d73cb9d64c8998",
  "trx_in_block": 64,
  "virtual_op": 0
}

{
  "block": 20391886,
  "op": [
    "comment",
    {
      "author": "greetbot",
      "body": "Hi. I am a bot that [looks for newbies who write good content](https://steemit.com/greetbot/@greetbot/introduction-updated)!\nYour post passed all of my tests.\n> @greetbot evaluated your post's quality score at ***[41.36] points***!\n### You get:\n - @greetbot's stamp of approval\n - A free resteem from @resteembot\n - An invitation to the [PAL Discord](https://discord.gg/GUuCXgY) - they give free upvotes\n--------\n![greetbot's stamp of approval](https://s10.postimg.org/3ksxxmpc9/stamp-250.png)\n[I also write bots and other code for crypto...](https://steemit.com/@greetbot/i-will-code-for-crypto).",
      "json_metadata": "",
      "parent_author": "yijunyu",
      "parent_permlink": "tips-for-locating-pokemon",
      "permlink": "re-yijunyu-tips-for-locating-pokemon-20180304t220525759z",
      "title": ""
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-04T22:05:27",
  "trx_id": "fa2df15e7942223aad486ac0524da9a624694731",
  "trx_in_block": 11,
  "virtual_op": 0
}

{
  "block": 20359556,
  "op": [
    "vote",
    {
      "author": "yijunyu",
      "permlink": "tips-for-locating-pokemon",
      "voter": "nitin.kshatriya",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-03T19:08:30",
  "trx_id": "5b68ff7f923fcf859b5b43d0f18044da80886cb5",
  "trx_in_block": 43,
  "virtual_op": 0
}

{
  "block": 20332775,
  "op": [
    "vote",
    {
      "author": "yijunyu",
      "permlink": "deep-learning-applied-to-deep-thoughts",
      "voter": "jeff747",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T20:49:15",
  "trx_id": "de9fd85098bf741b46aafbd32d915df5a9521c59",
  "trx_in_block": 44,
  "virtual_op": 0
}

{
  "block": 20332257,
  "op": [
    "comment",
    {
      "author": "yijunyu",
      "body": "@@ -1904,16 +1904,19 @@\n . Maybe \n+in \n his own \n",
      "json_metadata": "{\"tags\":[\"deep-learning\",\"arts\",\"styles\",\"travel\"],\"image\":[\"https://steemitimages.com/DQmdHyykj1PTRHRzqyEZPKWrsBEgp94Jj4Z3CPRT1QV5MEH/WechatIMG19.jpeg\",\"https://steemitimages.com/DQmf3sf8i6BcLDgQBFPwtc3sVAwfKdfoLgEFbufrikJxuWK/WechatIMG20.png\"],\"links\":[\"https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/android\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "deep-learning",
      "permlink": "deep-learning-applied-to-deep-thoughts",
      "title": "Deep Learning applied to Deep Thoughts"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T20:23:21",
  "trx_id": "7b686d73cdc1b076d5d044bbdf3b88139e9b3a92",
  "trx_in_block": 13,
  "virtual_op": 0
}

{
  "block": 20332100,
  "op": [
    "comment",
    {
      "author": "yijunyu",
      "body": "Thanks to my host who invited me along, I was visiting the Museum of Modern Arts in Manhattan New York City last week. The most famous item of the Museum collections is a painting by Vincent van Gogh, called The Starry Night. \n\n![WechatIMG19.jpeg](https://steemitimages.com/DQmdHyykj1PTRHRzqyEZPKWrsBEgp94Jj4Z3CPRT1QV5MEH/WechatIMG19.jpeg)\n\nThe painting was hanging on the wall since a donation to the museum in 1941 ... don't ask me how much it worths, must be millions, if not billions. Anyways, it is unique in the world and a masterpiece.\n\nWhile I was trying to take a photo, the safety guard reminded me that photographers must be at least two meters away from the painting... Suddenly, it reminded me of \"TF Stylize\" app in my pocket, which can convert a smartphone's camera into an artist's paintbrush. The Android app is one of the showcase examples from Google's Tensorflow, an open-source deep learning library, where you can build from scratch here: https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/android. \n\nOnce the app fired up, there is a panel of 26 existing paintings to choose from various artistic styles. Guess what? The Starry Night is one of them. Ah ha! It was not a coincidence that I came across this idea impromptu. \n\nNow I had the luxury to point the Stylize app towards the painting frame. It would stylize the painting using the style of the original painting itself, just in front of my naked eyes. \n\nNow you see this unique picture as a result:\n\n![WechatIMG20.png](https://steemitimages.com/DQmf3sf8i6BcLDgQBFPwtc3sVAwfKdfoLgEFbufrikJxuWK/WechatIMG20.png)\n\nTell me what you think of the picture. Is it more abstract, more beautiful, more impressive, or more absurd? Thousands of readers may have thousands of Hamlet, you will have your own judgment. My job as a \"Time Traveller\" who brought you back to the minds of the Master Van Gogh is done here. Maybe his own eyes, this painting would not worth that much of appreciation. It must be the people in the asylum who needed to treat him better while he was alive ... \n\nTo be honest, you may reproduce the picture next time holding the phone like this at the museum, but chances are you may get stuck in a long queue and do not have enough time to download the app to do the shot :-)\n\nNow it comes to the hard bit: if you would like to know more about Deep Learning, I am going to write more articles to explain the concepts using concrete examples like this. Stay tuned !",
      "json_metadata": "{\"tags\":[\"deep-learning\",\"arts\",\"styles\",\"travel\"],\"image\":[\"https://steemitimages.com/DQmdHyykj1PTRHRzqyEZPKWrsBEgp94Jj4Z3CPRT1QV5MEH/WechatIMG19.jpeg\",\"https://steemitimages.com/DQmf3sf8i6BcLDgQBFPwtc3sVAwfKdfoLgEFbufrikJxuWK/WechatIMG20.png\"],\"links\":[\"https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/android\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "deep-learning",
      "permlink": "deep-learning-applied-to-deep-thoughts",
      "title": "Deep Learning applied to Deep Thoughts"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T20:15:30",
  "trx_id": "df2e35818a8a2f59d0c94657625c0e2740f3f674",
  "trx_in_block": 35,
  "virtual_op": 0
}

{
  "block": 20330892,
  "op": [
    "vote",
    {
      "author": "yijunyu",
      "permlink": "tips-for-locating-pokemon",
      "voter": "yijunyu",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T19:15:06",
  "trx_id": "5d904367e662bac8bde3e3a5c7332e2c375275f6",
  "trx_in_block": 0,
  "virtual_op": 0
}

{
  "block": 20330885,
  "op": [
    "vote",
    {
      "author": "suesa",
      "permlink": "the-building-blocks-of-life-basics",
      "voter": "yijunyu",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T19:14:45",
  "trx_id": "3584983fc24cfc8d46d016bd4c8d72ff38582c66",
  "trx_in_block": 36,
  "virtual_op": 0
}

{
  "block": 20330183,
  "op": [
    "vote",
    {
      "author": "yijunyu",
      "permlink": "tips-for-locating-pokemon",
      "voter": "fel1xw",
      "weight": 10000
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T18:39:36",
  "trx_id": "975359754e669e0e36867cd1236cb05ccad36e85",
  "trx_in_block": 6,
  "virtual_op": 0
}

{
  "block": 20329261,
  "op": [
    "comment",
    {
      "author": "yijunyu",
      "body": "Pokemon Go is popular. Often you see children holding a smartphone, sometimes with their parents, looking for a monster in this game. What makes the game fascinating is in the cute, but also in the wild.  Uncertainty is the king here.\nThe GPS signals received by the smartphones can pinpoint where the player is (let's call it Location A), but not where the monster is (let's call it Location B). When the monster is around, the game will prompt you for their existence. However, such prompts cannot tell you directly the exact location B. The distance between A and B is, to a large extent, unknown. According to my son's experience, such a distance is very random, varying while the smartphone is probing for the monster: sometimes close, sometimes farther away. \n\nPrepare for a Scientific Experiment\n\nIf you are not afraid of some maths, please read on, how we came up with some hypotheses and verify them until we were close to the truth. \nAs mentioned earlier, we assumed initially that the location of the monster (B) is drifting, which was our first null hypothesis. While we encountered a monster and knew its location, instead of caught it immediately, we walked in all directions North, East, South, West, by some 200 meters from this location, until the monster disappeared from the \"radar\". We then noted down these locations and tracked back to where we had started (location B). In this way, suppose the hypothesis was true, that the monster's location drifts, then we should not see it always at the same location (B) and miss it at the other same locations. After several experiments, it was established that the monster stayed in about the same place. It did drift slightly due to the drifts of GPS signals, but those small drifting errors were tolerable. Therefore, we rejected the null hypothesis and concluded that once the monster is found, it won't leave its nest.\nAccording to some videos on YouTube!, once born Pokemon will last 15 minutes for your search. My son's encounters had demonstrated the fact hundreds of times, so it did not require any further experiments.\nNext, we came up with another hypothesis, that the distance between the Pokemon and where the smartphone warns its existence is constant. After several experiments, we found that's not true: the pokemon might be next to you, or it might be rather far. This distance is another random variable! We had to reject this null hypothesis again.\n\nEthics Concern\n\nOh well, could we fully solve this problem? I suggested hacking​ the Pokemon Go app in order to understand the truth from its source code. However, my son rejected this suggestion immediately because it could be against the copyright protection and might not be ethical. So we had to resort to external observations.\n\nMathematical Modeling and Derivation\n\nTaking out a piece of paper, I drew two circles around A and B. Suppose that the radius of these circles is RA and RB respectively, then the two circles intersect each other only when RA + RB > AB, where AB is the distance between A and B. Let's call the two intersecting points C and D. Without loss of generality, on the intersecting point C, we assumed that Pokemon Go would report the appearance of the monster, while the monster would disappear when it was outside the circle of B. Then C became a boundary point. The appearance and disappearance of a monster were two observable events, from which we could reduce the uncertainty as long as we could mark \"C\" up on the map.\n\nA simple corollary followed. Let's take a random direction to walk from C, until we reached another boundary point (i.e., where the monster appeared and disappeared), marking it up as D. Now, took the midpoint between C and D, and drew a vertical line across this midpoint, the monster should be on this line. According to this conclusion, we had found three monsters consecutively, very lucky! Indeed, not all out of the luck :-)\n\nThe three boundary points determine where the Pokemon is the center that has equal distance to them:\nhttps://ipfs.io/ipfs/QmWeuC5bYRG6cRgpn4847mYnFUqHycYPgCJz5iZbkYckzm\n\nA further question was, could we determine the location of the monster from C and D? Not yet. Although we had guessed the direction roughly, it still took quite some unnecessary steps. If only we could have another hint, the problem would have been fully solved. Suppose that we could find another boundary point, E, where the monster appeared/disappeared, then the monster should lurk at a place with equal distance to C, D, and E. This is called the circumcenter of the triangle CDE. \n\nOur follow-on experiments confirmed this finding, and it worked every time! \n\nSoftware Engineering of a Mobile App\n\nMy son was extremely happy, while I thought that the theoretical answer could be made even more practical ​if we could compute and mark the circumcenter of the three marked points on​ the map. Fortunately, Google Map API has the marker feature for this functionality. Adapting an open-source project on GitHub, I was able to engineer a solution after overcoming a few technical obstacles. Worth to mention was the fact that the Earth is round!​ The geolocations obtained from the GPS API concern latitude and longitude, rather than X-Y coordinates, making it a bit tricky to compute the circumcenter. Furthermore, the circumcenter computed from the triangle CDE was not visible on the map, instead, it was below the surface of the Earth and we needed to lift it up onto the surface using the radius of the Earth, and to convert the result back to latitude and longitude for the Google Map marker. \n\nDeriving the real-life location of Pokemon from this Augment Reality game on the globe:\nhttps://ipfs.io/ipfs/QmVCryrHLixkXBQ3qQFFBRt7yQixic98RMKYf5pPMrJ1wm\n\nThe moral of these experiments is teaching my son the scientific method for approximating the truth, which is never far away if we keep trying. \n\nThe source code of the Mobile App: https://github.com/yijunyu/pokemon-compass.",
      "json_metadata": "{\"tags\":[\"education\",\"fun\",\"game\",\"maths\",\"programming\"],\"image\":[\"https://ipfs.io/ipfs/QmWeuC5bYRG6cRgpn4847mYnFUqHycYPgCJz5iZbkYckzm\",\"https://ipfs.io/ipfs/QmVCryrHLixkXBQ3qQFFBRt7yQixic98RMKYf5pPMrJ1wm\"],\"links\":[\"https://github.com/yijunyu/pokemon-compass\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "education",
      "permlink": "tips-for-locating-pokemon",
      "title": "Tips for Locating Pokemon​"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T17:53:30",
  "trx_id": "3d6aa93beda6cd2c6038662c4f167aac70e5bf2c",
  "trx_in_block": 8,
  "virtual_op": 0
}

{
  "block": 20327538,
  "op": [
    "delegate_vesting_shares",
    {
      "delegatee": "yijunyu",
      "delegator": "steem",
      "vesting_shares": "30438.632978 VESTS"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T16:27:15",
  "trx_id": "2ee52c4e18ced7f44c5a49481d53f837b861c2e5",
  "trx_in_block": 29,
  "virtual_op": 0
}

{
  "block": 20326284,
  "op": [
    "account_create_with_delegation",
    {
      "active": {
        "account_auths": [],
        "key_auths": [
          [
            "STM6mjqvd41Lb2Ncni436hvpXkoUwV4K3uyaa4yEHaBsNgaBxfuTX",
            1
          ]
        ],
        "weight_threshold": 1
      },
      "creator": "steem",
      "delegation": "30690.000000 VESTS",
      "extensions": [],
      "fee": "0.100 STEEM",
      "json_metadata": "{}",
      "memo_key": "STM5fZwv5ZYPx2d9dGT83JZRzsWkg3EEvrTtcAYVkHZYX97HJcxQT",
      "new_account_name": "yijunyu",
      "owner": {
        "account_auths": [],
        "key_auths": [
          [
            "STM8mNbVgY7ghVKvMSXQ1ofpsVtX1hiRyodMcW2vDH7ja2iCbHHt2",
            1
          ]
        ],
        "weight_threshold": 1
      },
      "posting": {
        "account_auths": [],
        "key_auths": [
          [
            "STM7xoKxBxF2NC7GbNTmrHnQCkvhTp7kX566QYwyuWxgaGKCk5vup",
            1
          ]
        ],
        "weight_threshold": 1
      }
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-03-02T15:24:33",
  "trx_id": "814dd98c8ff4bdb187a998d8b45959bcebb7cf44",
  "trx_in_block": 68,
  "virtual_op": 0
}