...The worst offenders I have met in that regard ("Why would you need to prove your totals?") were mathematicians who apparently had never heard of that other mathematician - Fra Luca Bartolomeo de Pacioli ("the father of accounting and bookkeeping"). ...

Luca Pacioli: Father of Accounting - YouTube
(27min.)

Fra Luca Bartolomeo de Pacioli (sometimes Paccioli or Paciolo; c. 1447–1517) was an Italian mathematician, Franciscan friar, collaborator with Leonardo da Vinci, and a seminal contributor to the field now known as accounting. He is referred to as "The Father of Accounting and Bookkeeping" and he was the first person to publish a work on the double-entry system of book-keeping.[3] He was also called Luca di Borgo after his birthplace, Borgo Sansepolcro, Tuscany.[4]
From <https://en.wikipedia.org/wiki/Luca_Pacioli>;

Pacioli also documented the Rule of 72 to estimate  investment doubling or halving at different rates.
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Video: TED Talks - Tim Ferriss (13:21min.)
WHY YOU SHOULD DEFINE YOUR FEARS INSTEAD OF YOUR GOALS
https://embed.ted.com/talks/tim_ferriss_why_you_should_define_your_fears_instead_of_your_goals#
[..]
Tim Ferriss video notes:
He bought a book on "simplicity", which held the quote:
@05:20 He gave the quote: "We suffer more often in imagination than in reality." - Seneca the younger.
Which led to" Prememdiatio malorum" (the pre-meditation of evils).
Which led him to develop :fear-setting".
@06:00 He describes "Fear-Setting" (Goal-setting, but for FEARS). [@10:20 He does it once a quarter-year.]

3-pages of analysis
Page 1: What if I ,,,? (list of fears causing procrastination of action steps)
  Define: (the worst things/events you can imagine happening if you take that first step).
  Prevent: (what could be done to prevent each fered event feared, or devrease its likelihood).
  Repair: (if the worst-case scenarios eventuated, what could be done to repair the damage?Key: conside who are the likely people who have had to deal with such events and have useful experience of same and that you could learn from?)

Page 2: What might be the benefits of an attempt or partial success? (the upsides)

Page 3:
The Cost of Inaction (doing nothing).
(Emotionally, Physically, Financially, etc.)
    6 months-------- 1 year -------- 3 years
If one avoids the action for these periods, then what might be the result - what might one's life look like after those periods?

[..] quote: "Easy choices - hard life. Hard choices - easy life."

Sounds seriously interesting.
I've always been mistrustful of the positive thinking type of approach to life, and in favour of one that removes the negative ideas that get in the way [of life] . . .
but,
I got distracted by the wonderful Fr.Ted:**

Father Ted Series 1 Episode 1 - Dead Parrot:
https://www.youtube.com/watch?v=TAMsPEiSLyY

** I will definitely watch Ferriss once I'm finished Fr.Ted ;-)

...well worth watching
must read up a bit about stoicism too
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He essentially discovered that stoicism could be used as a tool to help his mind make the experience/perception of life endurable. It is the mind that makes it unendurable.

We cannot control events that occur in life, but we can control our response to those events.

To paraphrase Jack Benny: It's mind over matter - if you don't mind, it doesn't matter.
("Age is strictly a case of mind over matter. If you don't mind, it doesn't matter." - Jack Benny.)

The realm of consciousness is much vaster than thought can grasp.
When you no longer believe everything you think, you step out of thought and see clearly that the thinker is not who you are.
- Echkart Tolle.
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It is probably hardest to perceive the truth of that Echkart Tolle quote if/when one's perception has been clouded by one's mind creating the illusory/illusionary state of Ahamkara.
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POV Full Run - WORLD'S LARGEST PARKOUR COURSE (China Sky Ladder):

@p3lb0x:

https://www.youtube.com/watch?v=9edtHJMaws0

I laughed (political commentary)
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Thankyou! What a brilliantly rational little satire!
Actually, it would probably/arguably be more correct to call it a comment on the absurdity of cringeworthy political correctness, rather than the more serious business of "politics" per se.
Some of the comments about that video are rather interesting/amusing too.

For example: (edited for brevity/sense)

1. To be consistent, if a Google employee (James Damore) can be legitimately fired (sent to the GOOLAG™) for an unspecified "social crime" of "encouraging the use of sexual stereotyping", or something, when in fact he seemed to be merely applying logic/reason/evidence and exercising his right to free speech, in writing a 10-page evidence-based essay (including related research statistics and associated diagrams) entitled "Google’s Ideological Echo Chamber", then the account for this video should be blocked/closed/GOOLAGed for the same offence. By the same token, it could also bring into question the general social acceptability of the use of logic/reason/evidence for anything that is published on the Google networks, or the Internet or used in public discourse in the future.
2. The video is hateful content. If the zeroes notice this hateful content, then they won't show up in the office, and the rest of us who do will have to make stuff just with ones! Be more thoughtful next time!
3. It could be claimed that 1's are better than 0's, because - Would you want to be: an ON or an OFF; a TRUE or a FALSE; a YES or a NO?
4. The problem of 63 (where binary 111111 = decimal 32+16+8+4+2+1) not being "diverse" enough could perhaps be "fixed" by adding 6 or more [non-significant] zeroes before the ones - i.e., 000000111111. This would give an even distribution - 50% ones and 50% zeroes - but where all the zeroes would be adding nothing to the number, which latter point could make for an interesting analogy.
5. ..."1 is the loneliest number".
6. "Bringing 4:30 ( after the red 1 says: 'Today, I numerically identify with the square root of 2 divided by Pi.') and not going into the complex identities of irrational numbers? Bigot! The lack of representation of i (imaginary unit) offends me as well!?"
7. Quote

   Politiekman: "There are only 10 sexes."
   Bolek Lolek: (in response) "the word "sex" comes from Latin "half", so by definition there can only be two.
   _____________________

   Quote

   sex/sexus: ..."Commonly taken with seco as division or 'half' of the race" [Tucker], which would connect it to secare "to divide or cut" (see section (n.)). ...
   - Copied from: Online Etymology Dictionary - <http://www.etymonline.com/index.php?allowed_in_frame=0&search=sexus>;

8. Quote

   Parabalani: "I think people who did not study computing will find it difficult to understand this."
   Marc: (in response) "Having a brain is enough for this video."

9. Quote

   Adrian Blom: "this video will fly over many a head."
   JG: (in response} "Like an attack helicopter, which I happen to identify as."
   wolfie498: (in response) "Most heads unfortunately."

Scifi short about VR with a premise seen before. Still has nice visuals and a pretty good sound direction

Vid about the Trappist-1 System, 'only' 40 light years from here:
https://www.youtube.com/watch?v=HTPfYxE9c2U
I watched the vid, and woke up the next morning to the realization that Trappist-1 could be a preview of our Sol-Earth system, after our sun turns 'red giant' and smokes all its planets and degenerates their orbits, then turns 'white dwarf'.

Tim Sullivan's A Christmas Treat:

@panzer: That is one amazing video. Thanks for sharing.

Here's a contribution from me:
The mechanics of history - Yoann Bourgeois - YouTube - <https://www.youtube.com/watch?v=NW53foOlQaw>;
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EDIT 2017-11-06: The above video seems to have been removed. The one below (which is in B&W) is still available, and I also found an HD colour version of the same thing, here: <https://www.youtube.com/watch?v=2dNSm_rKuFE>;

________________________________

- and this (B&W):

Karate Girl 12 minute condensed version
https://www.youtube.com/watch?v=TzVfzAel2Qo

Edit: PS - In reference to the recent thoroughly deplorable and despicable Las Vegas concert massacre, someone should do either a compilation of short vids, or a sidebar stack of dynamically linked YT vids, and title it 'Vegas Has Fallen'.

Slaughterbots
https://www.youtube.com/watch?v=FkpZOieuIjA

Edit: Can someone please tell me what the musical score is to the following video?
https://www.youtube.com/watch?v=Tg4HAJz8APA
BTW, I do -not- endorse the website he is promoting; truereality.org; I only enjoy playing the vid for the music and video showing the 'helical motion' of our solar system.

Jeff explains his relationship - Coupling:

Here's a series of short movies made with the Unity game engine:
ADAM: Episode 1:

they were great
got very dramatic...