Telegram RegisterThe public register of Telegram
Telegram profile photo for علوم پایه مدتست

Channel

علوم پایه مدتست

@medtest2

On this record: Topic · Growth · Engagement · What this channel posts · Reactions · Posts · Posts edited after publishing · Polls · Citations · Telegram's recommendations · Cite this entry

11,380subscribers

+18 since we began measuring on 7 August 2026

Risers and fallers across the register · movement among entries of 10,000–31,623.

Register entry

Telegram ID-1001918959381
TypeChannel
Username@medtest2
CreatedBetween 1 April 2023 and 31 October 2023 — estimated from Telegram’s id allocation, not measured. How this range is calculated.
First recorded7 August 2026
Last confirmed live20 October 2026
Measurements held42
Confirmed unchanged1 time, most recently 20 October 2026
On Telegramt.me/medtest2

Topic

Education — a classification, not a measurement. An on-box language model (Qwen3.6-35B-A3B-FP8, prompt version 1) read this channel’s own recent posts on 11 September 2026 and assigned it the closest of 31 fixed categories, at 100% confidence. This is a model’s judgement about what the channel is likely to be about, not a fact this register measured the way a subscriber count or a view count is measured — it can be revised on a later pass, and it carries no weight anywhere else on this page. How this classification works, and why it has no browse page of its own yet.

Growth

11,35711,79411,575.57 August 2026 — 11,362 subscribers8 August 2026 — 11,357 subscribers9 August 2026 — 11,359 subscribers10 August 2026 — 11,375 subscribers11 August 2026 — 11,392 subscribers12 August 2026 — 11,400 subscribers13 August 2026 — 11,399 subscribers15 August 2026 — 11,404 subscribers16 August 2026 — 11,419 subscribers17 August 2026 — 11,433 subscribers18 August 2026 — 11,441 subscribers19 August 2026 — 11,449 subscribers20 August 2026 — 11,453 subscribers22 August 2026 — 11,457 subscribers24 August 2026 — 11,456 subscribers25 August 2026 — 11,464 subscribers26 August 2026 — 11,471 subscribers27 August 2026 — 11,475 subscribers28 August 2026 — 11,509 subscribers29 August 2026 — 11,513 subscribers30 August 2026 — 11,522 subscribers31 August 2026 — 11,533 subscribers1 September 2026 — 11,555 subscribers2 September 2026 — 11,570 subscribers4 September 2026 — 11,579 subscribers6 September 2026 — 11,606 subscribers10 September 2026 — 11,611 subscribers12 September 2026 — 11,627 subscribers13 September 2026 — 11,689 subscribers15 September 2026 — 11,743 subscribers17 September 2026 — 11,780 subscribers27 September 2026 — 11,794 subscribers4 October 2026 — 11,657 subscribers9 October 2026 — 11,621 subscribers13 October 2026 — 11,613 subscribers14 October 2026 — 11,537 subscribers15 October 2026 — 11,514 subscribers16 October 2026 — 11,487 subscribers17 October 2026 — 11,448 subscribers18 October 2026 — 11,418 subscribers19 October 2026 — 11,398 subscribers20 October 2026 — 11,380 subscribers11,3807 August 202620 October 2026
42 measurements spanning 74 days, net +18. Dots are measurements; the straight line between them is drawn to join them, not to claim we know the path taken in between — snapshots are recorded only when a count changes, so gaps mean “no change observed”, never “interpolated”. The vertical axis spans 11,291–11,860 and does not start at zero.
Measurement log — every subscribers count we have recorded, most recent 20 of 42
Measured (UTC)SubscribersChange
20 Oct 2026, 22:5411,380-18
19 Oct 2026, 21:3911,398-20
18 Oct 2026, 22:0911,418-30
17 Oct 2026, 20:0711,448-39
16 Oct 2026, 19:2611,487-27
15 Oct 2026, 17:4611,514-23
14 Oct 2026, 21:2111,537-76
13 Oct 2026, 10:5811,613-8
9 Oct 2026, 08:4111,621-36
4 Oct 2026, 19:3511,657-137
27 Sept 2026, 05:3611,794+14
17 Sept 2026, 14:1711,780+37
15 Sept 2026, 15:1911,743+54
13 Sept 2026, 21:3711,689+62
12 Sept 2026, 06:2111,627+16
10 Sept 2026, 01:4011,611+5
6 Sept 2026, 20:5811,606+27
4 Sept 2026, 04:3711,579+9
2 Sept 2026, 18:0211,570+15
1 Sept 2026, 16:4711,555first reading

Engagement

200 posts held, back to 5 August 2026 — the reader has not yet reached the start of this channel’s public history, so older posts may sit further back, unread. Read across 43 pages of Telegram’s post history, 20 posts per page.

Nothing published in the last 30 days. ERR and ER are rolling 30-day measures, so there is nothing to compute — we hold 200 posts for this entry, the most recent from 2 September 2026. An engagement rate over an empty window would be a number about nothing.

What this channel posts

Video runtime
26m 23s
Average length
57s

Measured directly from 28 videos with a duration reading, out of the posts we hold for this channel — not this channel’s whole posting history, only the sample this register has actually read. An exact reading to the second, taken from the post itself rather than from Telegram’s own rounded chrome, so it carries no ≈ mark.

Reaction mix

2,725 reactions across 197 posts, in 1 kind.

Every reaction kind recorded on the sample, most used first
ReactionCountShareShare, drawn
❤2,725100.0%

No sentiment is inferred, and none should be read in. This table is ordered by count and by nothing else. Emoji do not carry stable meaning across languages or communities — 🙏 is thanks in one channel and mourning in another — so we publish which ones were pressed and how often, and pass no judgement on what an audience meant by them.

Precision. Telegram publishes reaction counts per emoji and short-forms each one — 4.34K, 1.2M — so any single kind at or above 1,000 reaches us at three significant figures, and only counts below 1,000 are exact. The shares above are ratios of those figures and carry the same error. This is also why the total here can differ slightly from a reaction total printed elsewhere on the page: both are sums of the same rounded parts, taken over samples with different edges.

Coverage. Reactions were read on 198 of the 200 sampled posts in this sample. Summed by Telegram’s own count on each post — not by adding up the per-emoji breakdown above — those same posts carry 2,725 reactions in total: the kind of figure the paragraph above means by “a reaction total printed elsewhere on the page”.

Measured over the 200 most recent posts we hold, published 5 August 2026 to 2 September 2026, using the newest reading held for each. Telegram Stars are excluded: they are a payment, not a reaction, and they have their own section.

Recent posts

2 Sept 2026, 17:35 UTC594 views14 reactionsread 2 September 2026

📌 یه اشتباه رایج توی دوران جمع‌بندی: اینکه بشینی دوباره از اول یه درس رو کامل بخونی، بدون اینکه بدونی کدوم قسمت‌ها بیشتر به درد آزمون می‌خورن!❌ توی این روزها بهتره مطالعه‌ت سؤال‌محورتر بشه؛ یعنی ببینی از هر مبحث چه تیپ‌هایی سؤال شده، کجاها بیشتر تکرار شدن و کدوم نکات هنوز برات ضعف محسوب میشن📝 جمع‌بندی یعنی انتخاب هوشمندانه‌تر، نه فقط بیشتر خوندن🎯 آدرس 🤩 | لینک 🤩 دیدنِ 🤩 | معرفی 🤩

❤14

2 Sept 2026, 15:02 UTC766 views10 reactionsread 2 September 2026

🦠 یه نکته درباره ویروس که خیلی وقت‌ها نادیده گرفته میشه: قرار نیست برای مسلط شدن به ویروس‌شناسی، تک‌تک مطالب رو جداگانه حفظ کنی! وقتی ارتباط بین ویروس‌ها، ویژگی‌هاشون و تیپ سؤال‌هایی که ازشون مطرح میشه رو بفهمی، خیلی از نکات به هم وصل میشن و مرورشون هم راحت‌تر میشه🧠 پس اگه ویروس برات هنوز یه عالمه اسم پراکنده‌ست، احتمالاً مشکل از حجم درس نیست؛ از مدل مطالعه‌شه😉 آدرس 🤩 | لینک 🤩 دیدنِ 🤩 | معرفی 🤩

❤10

2 Sept 2026, 07:01 UTC≈1,010 views17 reactionsread 2 September 2026

و اما پرونده‌ی بعدی… 🦠 ویروس‌شناسی! از اون درسایی که وقتی بخوای تک‌تک ویروس‌ها رو جداگانه و بدون دسته‌بندی حفظ کنی، خیلی زود تبدیل میشه به یه عالمه اسم و عدد و نکته‌ی قاطی‌پاتی 🫠 ⬅️ ولی وقتی مطالب رو دسته‌بندی‌شده و بر اساس تیپ تست‌ها ببینی، داستان خیلی قابل‌کنترل‌تر میشه. حتی ساختار تدریس فینیشینگ ویروس هم بر همین اساس طراحی شده؛ درسنامه طبقه‌بندی‌شده + تحلیل تست‌های سال‌های اخیر + کتابکار برای مرور📝😍 آدرس 🤩 …

❤17

1 Sept 2026, 15:24 UTC≈1,210 views18 reactionsread 2 September 2026

حالا بریم سراغ یکی از دو پرونده‌ای که هنوز روی میز مونده… 👀 💉 ایمنی‌شناسی همایشی که قرار نیست فقط بشینی چند ساعت مطلب گوش بدی؛ قرارِ مباحث مهم رو از زاویه‌ی تست و نکات پرتکرار ببینی و برای جمع‌بندی نهایی مرتبشون کنی📝 دقیقاً همون چیزی که تو این بازه بیشتر از هر چیز بهش نیاز داری: کمتر پراکنده‌خوانی، و تمرکز بیشتر روی چیزهای مهم🎯

❤18

1 Sept 2026, 13:10 UTC≈1,330 views7 reactionsread 2 September 2026
Poll

یه اعتراف کوچولو، کدوم درس علوم پایه رو هر بار باز میکنی با خودت میگی: «این دیگه آخرین باره که می‌خونمش» ولی چندروز بعد دوباره برمیگردی سراغش؟❕

  1. فیزیولوژی👍30%
  2. ویروس🦠16%
  3. ایمنی🚫17%
  4. اناتومی📝58%

The shares total 121%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

❤7

1 Sept 2026, 10:03 UTC≈1,360 views18 reactionsread 2 September 2026

⭕️ اگه تو هم فکرمیکنی توی دوران جمع بندی باید همه‌چی رو دوباره از اول بخونیم! سخت در اشتباهی❗️🫠 در حالی که الان وقتِ پیدا کردن نقاط ضعفه، نه دوباره‌خوانی کورکورانه❌ 🟣یه مبحث رو مرور کن 🟣چندتا تست بزن 🟣غلط‌هات رو جدا کن 🟣همون قسمت‌هایی که مشکل داشتی رو برگرد و بخون اینطوری هر ساعت مطالعه‌ت دقیقاً روی چیزی میره که بهش نیاز داری🎯 جمع‌بندی یعنی هدفمندتر خوندن، نه فقط بیشتر خوندن❤️‍🔥

❤18

1 Sept 2026, 07:54 UTC≈1,350 views18 reactionsread 2 September 2026

روز بخیر به تیمی که هنوز داره برای این آزمون می‌جنگه! ☀️🫀 این روزای آخر قرار نیست با حجم مطالعه‌ت رکورد بزنی؛ قرارِ از ساعت‌هایی که داری، بیشترین نتیجه رو بگیری🌟 پس امروز هم قراره باهم جلو بریم؛ یه کم درس، یه کم تست و کمی هم جمع‌بندی 👀🔥

❤18

31 Aug 2026, 14:52 UTC≈1,500 views17 reactionsread 2 September 2026
Video

❗ همایش جمع بندی واقعا برای چه کسی مناسبه؟ ⬅️ پاسخ این سوال رو از زبان خود مدرس همایش‌های جمع بندی بشنوید: 🤩دکترسیدعلی معتمدشریعتی، رتبه ۱ کشوری آزمون علوم پایه ⏰ اگر تو ام یه ماه دیگه ازمون علوم پایه داری ، حتما این ویدیو رو ببین تا بدونی باید چیکارکنی✔️

❤17

31 Aug 2026, 10:52 UTC≈1,530 views17 reactionsread 2 September 2026

یه اشتباه رایج توی جمع‌بندی اینه که فکر می‌کنیم: «باید اول همه‌چی رو کامل بخونم، بعد برم سراغ تست.» در حالی که توی این مرحله، تست خودش بخشی از مطالعه‌ست🧠 وقتی تست‌های سال‌های قبل رو می‌بینی، تازه متوجه می‌شی کدوم قسمت‌های یه فصل واقعاً ارزش وقت گذاشتن دارن و کدوم‌ها نه. پس اگه هنوز داری با وسواس دنبال «کامل خوندن» می‌ری جلو، یه بار استراتژیتو مرور کن👀

❤17

31 Aug 2026, 06:41 UTC≈1,530 views16 reactionsread 2 September 2026

صبح بخیر به رفقای علوم پایه‌ای 💓 یه سؤال برای شروع امروز: اگه قرار باشه فقط یک درس رو امروز جدی‌تر از همیشه بخونی، کدومو انتخاب می‌کنی؟ 👀 نه لزوماً سخت‌ترین درس… همونی که می‌دونی اگه امروز یه قدم جلو ببریش، شب حس بهتری داری😌📚 بزن بریم که امروز هم یه تیک دیگه از مسیرمون بخوره ✅

❤16

30 Aug 2026, 19:27 UTC≈1,730 views10 reactionsread 2 September 2026

🚨 یه اشتباه خطرناک توی ۳۰ روز پایانی: اینکه هر روز با یه لیست بلندبالا از مطالب جدید شروع کنی و آخر شب فقط تیک بزنی که «امروز هم خوندم». توی این مرحله باید بین این سه‌تا تعادل داشته باشی: 📚 مطالعه‌ی باقی‌مانده‌ها 📝 تست و تحلیل 🔁 مرور مطالب قبلی اگه یکی از این سه‌تا کامل حذف بشه، یه جای کار می‌لنگه. ⬅️ جمع‌بندی درست یعنی مدیریت همین سه‌تا کنار هم🧠

❤10

30 Aug 2026, 15:51 UTC≈1,720 views18 reactionsread 2 September 2026

یه یادآوری مجدد برای اونایی که فکر می‌کنن «خب فیزیولوژی که تموم شد، دیگه کاری نداریم» 😅 نه رفیق! تازه وارد بخش مهم ماجرا شدیم👀 بعد از فیزیولوژی، هنوز ایمنی‌شناسی و ویروس‌شناسی رو هم داریم😎؛ 🧬 همایش جمع‌بندی ایمنی‌شناسی ⬅️ ۲۴ شهریور 🦠 همایش جمع‌بندی ویروس‌شناسی ⬅️ ۲۶ شهریور 💎 یعنی این ماه قراره چندتا از درس‌های مهم رو یکی‌یکی از حالت «پراکنده و حجیم» برسونیم به حالت جمع‌شده و آزمونی 😎

❤18

Showing the 12 most recent of 200 posts we hold for @medtest2. View and reaction counts are the latest single reading for each post, not a live figure, and a recent post is still accumulating both. A view count marked ≈ was rounded by Telegram before we ever saw it — t.me prints views in full below 1,000 and to three significant figures above, so ≈1,200,000 means somewhere between 1,150,000 and 1,249,999. Unmarked counts are exact. Text is reproduced from the public post preview and truncated for length.

Posts edited after publishing

@medtest2 edited 1 post after it first published — the same permalink now carries different wording than the one this register originally read, caught because our own crawl held a copy of the earlier text.

An edit is not deception. Typo fixes, price updates and corrections look exactly like this too — this register can tell you the wording changed and when, not why. How this is measured.

First edit seen
8 August 2026
Most recent edit
8 August 2026

Polls

The 6 most recent of 13 polls we hold for this entry, as Telegram rendered them when we read the post. A poll’s figures keep moving after that, so each one is dated.

1 Sept 2026, 13:10 UTCAnonymous Poll303 voters

یه اعتراف کوچولو، کدوم درس علوم پایه رو هر بار باز میکنی با خودت میگی: «این دیگه آخرین باره که می‌خونمش» ولی چندروز بعد دوباره برمیگردی سراغش؟❕

  1. فیزیولوژی👍30%
  2. ویروس🦠16%
  3. ایمنی🚫17%
  4. اناتومی📝58%

The shares total 121%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

28 Aug 2026, 10:18 UTCAnonymous Poll253 voters

بزار یه اعتراف کوچیک داشته باشیم 😂👇 اگه همین الان آزمون علوم برگزار بشه، وضعیت فیزیولوژیت چطوره؟

  1. بزن بریم، آماده‌ام 😎13%
  2. یه مرور جدی لازم دارم🤡24%
  3. یه عالمه خوندم ولی قاطی کردم 🥲9%
  4. فعلا ترجیح میدم به این سوال فکرنکنم🙄58%

The shares total 104%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

24 Aug 2026, 18:10 UTCAnonymous Poll270 voters

همین الان وضعیتت تو فیزیولوژی به کدوم موقعیت نزدیکتره؟ 🤨

  1. تقریبا مسلطم، فقط مرور می خوام 📝16%
  2. خوندم ولی خیلی چیزا قاطی شده 😔16%
  3. یه قسمت هایی رو هنوز جدی نخوندم 😬21%
  4. فیزیولوژی ❓ من و فیزیولوژی هنوز در مرحله آشنایی هستیم 💍50%

The shares total 103%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

21 Aug 2026, 14:09 UTCAnonymous Poll168 voters

وقتی یه تست و غلط می زنی، معمولا چیکار می کنی ❓

  1. ❗️جواب رو نگاه می کنم و رد میشم26%
  2. 📝 برمی گردم کل مبحث رو دوباره می خونم5%
  3. 💬 بررسی می کنم چرا غلط زدم و نکته ش و در میارم71%
  4. می زنم صفحه بعد و امیدوارم دیکه نیاد6%

The shares total 108%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

20 Aug 2026, 13:53 UTCAnonymous Poll150 voters

انتخابت کدومه ❓

  1. 3ساعت مطالعه خط به خط یک فصل 📖15%
  2. ساعت مرور نکات مهم + 2 ساعت تحلیل تست های سال های اخیر 📝87%

The shares total 102%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

19 Aug 2026, 08:57 UTCAnonymous Poll132 voters

پاسخ؟

  1. الف72%
  2. ب13%
  3. ج8%
  4. د11%

The shares total 104%, above 100: this poll accepts more than one answer per voter. No per-option vote count is published, so the number of voters who chose each option is not derivable and is not shown.

Percentages only — there are no per-option vote counts here, because Telegram publishes none. The public post preview gives each option’s share and a single voter total, and nothing else. Multiplying one by the other would produce a per-option tally that looks measured and is not: the shares are rounded to whole numbers before we ever see them. We print what was published and leave the column that does not exist empty.

The shares need not add up to 100. Rounding alone puts many polls at 99 or 101. A poll that allows more than one answer per voter runs well past 100 by design, and several here do. The bars are drawn against a fixed 100% track at each option’s own percentage rather than normalised to the total, so a poll that exceeds it shows that it does instead of being quietly rescaled.

Read from the 200 most recent posts we hold, published 5 August 2026 to 2 September 2026. Telegram labels each poll by kind — an anonymous poll, a quiz, a closed set of final results — and that label is reproduced rather than paraphrased.

Forward network

Built only from forwarded posts we have actually read, on both sides. Coverage is early and deliberately incomplete: a missing link means we have not read the post that would prove it, never that the relationship does not exist. Counts are distinct forwarded posts observed, so they only ever go up as we read more.

Mentions

A mention is a weaker signal than a forward and is counted separately for that reason — naming a channel is not republishing it, and a handle in a post body is easy to place deliberately. The post counts beside each row below are distinct posts in which the handle appeared, from posts we have read on both sides — the “Named by N registered channels” figure above is a different count, of distinct NAMING CHANNELS rather than posts, and is not the sum of the rows under it.

Appears in Telegram’s recommendations for other channels

The reverse of the list above, and a different kind of signal. This does not require this channel to have ever been asked about directly — each row below is a channel we DID ask Telegram about, whose Telegram-generated list happened to include this one. A channel can appear here with an empty list above it, because being named by someone else’s query is independent of having been queried itself.

علوم پایه | مدوفست
@medofast_oloompaye · 22,140
Telegram ranks this channel #2 of 91 here — alongside 90 others — read 20 September 2026
علوم پایه ۹۹
@Olumpaye99 · 25,739
Telegram ranks this channel #5 of 95 here — alongside 94 others — read 14 September 2026
علوم پایه پزشکی و دندان‌پزشکی
@oloompaye · 22,293
Telegram ranks this channel #6 of 93 here — alongside 92 others — read 20 September 2026
مدیکالیسم | medicalism
@Doctor_MIB_iran · 40,321
Telegram ranks this channel #12 of 89 here — alongside 88 others — read 26 August 2026
کار دانشجویی علوم پزشکی | مدیلنسر
@medilancer · 97,704
Telegram ranks this channel #12 of 93 here — alongside 92 others — read 18 August 2026
دانشجویان علوم پزشکی
@medicall_students · 79,954
Telegram ranks this channel #13 of 79 here — alongside 78 others — read 19 August 2026
فیلمومِد
@Learningvideos99 · 39,316
Telegram ranks this channel #17 of 91 here — alongside 90 others — read 31 August 2026
Medical_PDF💉
@pdfvahidzali · 87,494
Telegram ranks this channel #17 of 90 here — alongside 89 others — read 18 August 2026
Medical University 🏛⚕
@medicaluniversity · 83,353
Telegram ranks this channel #18 of 89 here — alongside 88 others — read 18 August 2026
دانلود کتاب و جزوه | کتابخانه علوم پزشکی
@med_science · 31,196
Telegram ranks this channel #19 of 96 here — alongside 95 others — read 6 September 2026
تیم دانشجویان علوم پزشکی
@Team_MedicalSciences · 26,027
Telegram ranks this channel #22 of 87 here — alongside 86 others — read 13 September 2026
بالینوما | Balinoma
@Balinoma · 22,616
Telegram ranks this channel #29 of 91 here — alongside 90 others — read 25 September 2026
داروشناسی پزشکی
@medical_drugs1 · 51,509
Telegram ranks this channel #33 of 95 here — alongside 94 others — read 24 August 2026
خلاصه های بالینی | مدوفست
@medofast_balini · 35,746
Telegram ranks this channel #36 of 90 here — alongside 89 others — read 4 September 2026
بانک PDF پزشکی📚
@PDFbankdaro · 32,258
Telegram ranks this channel #50 of 94 here — alongside 93 others — read 5 September 2026
پُست کشیک
@postkeshik · 39,445
Telegram ranks this channel #50 of 95 here — alongside 94 others — read 31 August 2026
توییتر دانشجویان علوم پزشکی
@medtweeet · 85,040
Telegram ranks this channel #56 of 95 here — alongside 94 others — read 18 August 2026
برایِ...! | موزیک
@BarayeChnl · 40,782
Telegram ranks this channel #60 of 66 here — alongside 65 others — read 29 August 2026
📥منبع فایل (PDF) علوم پزشکی📤 (Medfile_Pharma)
@medfile_pharma · 47,848
Telegram ranks this channel #66 of 93 here — alongside 92 others — read 27 August 2026
Med Line | مِد لاین
@Medical_line · 38,375
Telegram ranks this channel #79 of 90 here — alongside 89 others — read 1 September 2026

This channel appears in 20 seed channels' Telegram-generated recommendation lists in total. Each is Telegram’s list for THAT channel, not this one — see how this is measured.

Cite this entry

A live page changes as we take new readings, so a citation should name the measurement it is based on, not just the URL. The line below cites the subscriber count as measured 20 October 2026 — this entry's latest reading, not the date you are reading this.

“علوم پایه مدتست” (@medtest2), 11,380 subscribers as measured 20 October 2026. Telegram Register, tgregister.com/channel/medtest2.

Full measurement history, CC BY 4.0. Every reading this register holds for this entry, not just the latest one, as a dated, downloadable record: CSV · JSON. Free to use with attribution to tgregister.com. Each file carries its own generation timestamp, which is the figure to cite for exactly when the data was retrieved.