Squarespace: www.squarespace.com/numberphile
More links

Tom has come up with many ideas over the years, but its time to let some of them go.
MATT: youtube.com/unnamedculprit | TOM: youtube.com/TomScottGo

Similar from Matt:
Five Minutes in Matts Mind: www.youtube.com/watch?v=Xdl7VaxdTzA

Pendulum — Slam: www.youtube.com/watch?v=eyAA18es8es
(the bit we were singing was 1m20 in)

Disco carriages in trains: www.youtube.com/watch?v=ObEJk4bAV8M

Pips: en.wikipedia.org/wiki/Greenwich_Time_Signal

tomscott.com — @tomscott — Remember the «dumbest dot-com», AllAdvantage? They paid you to surf the web, at least for a while. And one day, they announced that they were incredibly popular in rich Beverly Hills, California. The reason connects them to the US Postal Service… and Jason Priestley.

#Timekeeping #History #ExploreMode
A lot goes on in just 24 hours. But why is a day divided in 24 hours in the first place? Who decided how we would calculate it?

Today, time is tucked away in our pockets, just an unlock button away. It drives our technology, with atomic clocks being responsible for precise GPS location services and speedy internet search results.

Our ancestors, on the other hand, didn’t have it that easy. Time for them was written in the stars, in the sunrise and sunset, in the moon’s waning and waxing.

So how did we go from looking up to celestial bodies to looking down at our phones for time? What other timekeeping methods did ancient humans use before watches and clocks became ubiquitous? And what the heck is an atomic clock?

You’re watching Explore Mode and today, we are diving into time, and how humans developed technologies to measure it.

01:20 Telling time through stars, celestial bodies, and sundials
02:03 Candle clocks and incense clocks / How did candle clocks work?
03:32 Sexagesimal system explained / Why is time divided in the 60s?
04:45 How do waterclocks work? The clepsydra.
06:13 Origin of mechanical clocks
07:06 How do quartz clocks work?
08:17 How do atomic clocks work?

A Brief History of Timekeeping | How Humans Began Telling Time | EXPLORE MODE

Music:
Willow and the Light, Wholesome, Stompdance and Covert Affair
Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/by/3.0/

Medieval Song Village Consort
Always No Copyright Music | Free Music for Everyone

www.youtube.com/watch?v=eZ_r1H9vHkI

Sources:
www.sciencedaily.com/releases/2013/03/130314085052.htm
www.nbcnews.com/science/science-news/ra-romans-used-ancient-egypt-obelisk-sundial-flna2D11826215
blogs.scientificamerican.com/roots-of-unity/the-joy-of-sexagesimal-floating-point-arithmetic/
www.britannica.com/science/sexagesimal-number-system
en.wikipedia.org/wiki/Water_clock
science.howstuffworks.com/environmental/green-tech/sustainable/water-powered-clock1.htm
www.explainthatstuff.com/quartzclockwatch.html
electronics.howstuffworks.com/gadgets/clocks-watches/quartz-watch.htm
science.howstuffworks.com/question40.htm
www.livescience.com/32660-how-does-an-atomic-clock-work.html
www.nature.com/articles/s41586-018-0738-2

Produced by Sofia K.
Edited by Amanda Lee

Thanks to all the Heathrow team! They asked us to plug «Heathrow: Britains Busiest Airport». It starts 8pm, Wednesday 2nd May on ITV: www.heathrow.com/more/britains-busiest-airport?CMP=SO-IAPBBA103

MATT: youtube.com/MattGrayYes | TOM: youtube.com/tomscottgo

MUSIC:
Local Elevator by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: incompetech.com/music/royalty-free/index.html?isrc=USUAN1300012
Artist: incompetech.com/

Tom flew on a Zero-G flight with the European Space Agency for this week’s video on his channel. This is the behind the scenes.
MATT: YouTube.com/unnamedculprit | TOM: YouTube.com/TomScottGo

(And if youre from a space agency, do get in touch! www.tomscott.com/contact/ )

How Zero-G Planes Work
www.youtube.com/watch?v=FO_Ox_dH0M8

If youre a masters or PhD student from an ESA member state, and zero-g sounds like your thing, have a look at the Fly Your Thesis program: www.esa.int/Education/Fly_Your_Thesis — the 2017-18 submissions are closed, but that just gives you time to start planning for next year…

techdif.co.uk — Were back! We start with the tale of Thomas Trueblood, rapidly steer off into the 1904 Olympic marathon — perhaps the most ridiculous Olympic race ever — and then have a quick discussion about a man called Jam Handy. Get your mystery biscuits ready.

BONUS MATERIAL — Gary Spots an Ice Cream Van: youtu.be/a5Q04hmXmjY
THE FULL PLAYLIST: www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp

TOM is @tomscott and at tomscott.com
GARY is @garybrannan
MATT is @unnamedculprit and at mattg.co.uk
CHRIS doesnt do this social media nonsense.

A web app that works out how many seconds ago something happened. How hard can coding that be? Tom Scott explains how time twists and turns like a twisty-turny thing. Its not to be trifled with!

A Universe of Triangles: www.youtube.com/watch?v=KdyvizaygyY
LZ Compression in Text: www.youtube.com/watch?v=goOa3DGezUA
Characters, Symbols and the Unicode Miracle: www.youtube.com/watch?v=MijmeoH9LT4

More from Tom Scott: www.youtube.com/user/enyay and twitter.com/tomscott

www.facebook.com/computerphile
twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Harans Numberphile. See the full list of Bradys video projects at: bit.ly/bradychannels

Наблюдение вращающихся тел и измерение частоты вращения с помощью стробоскопа.

Гервидс Валериан Иванович — доцент кафедры общей физики МИФИ, кандидат физико-математических наук.