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92%VideoOct 2011

Carl Sagan explains Kepler's laws of planetary motion

(5:53) Johannes Kepler (1571 - 1630) was a German mathematician and astronomer. He is best known for his eponymous laws of planetary motion. From COSMOS: A Personal Journey.


91%VideoJan 2012

Sixty Symbols - How 3D glasses work

(10:26) Professor Phil Moriarty from Nottingham University explains how 3D films give us the perception of depth. The technology is deceptively simple and makes clever use of the properties of light.


91%VideoJun 2012

How an atomic clock works

(4:33) Bill Hammack, aka The Engineer Guy, shows how an atomic clock works, and why it's accuracy level of over one second in 100 million years is essential for GPS to work properly.


91%VideoAug 2009

Around the corner, how a differential works

(9:31) Excellent tutorial from the 30's on the principles and development of the differential gear.


91%VideoSep 2010

Hamilton Watch Company presents: How a watch works

The inside story of a fine watch. Documentary from 1949 explaining watch mechanisms on a giant watch model.


90%AnimationMay 2014

What is the Stock Exchange, and how does it work?

(3:34) Why are there stocks at all, and why do people trade their shares? The Stock Exchange cleanly explained by Kurzgesagt.

90%VideoJan 2016

How do we know the age of the Earth?

(9:58) Geologist James Powell explains modern dating methods.


90%AnimationMay 2012

Measuring the Universe

(4:16) Video from free exhibition at the Royal Observatory in Greenwich, London, to mark the 'transit of Venus'.


90%AnimationJun 2012

How does the Internet work?

(3:22) What actually happens when you visit a web page? World Science Festival created this clip to show you how that beautiful web page you sought ends up on your screen.


90%VideoJun 2014

How nuclear power makes electricity

(3:53) Succinctly explained by Jem Stansfield on BBC's science program 'Bang Goes The Theory'.