Picture Wall - 7 pics
Bicycle – Bartosz Ciechanowski
The world is having engine trouble
Good vibrations with strong magnets
Hydrophobic Patterns Make Spinning Water Drops - The Action Lab
We Built An Unrideable Bike To Show How Bikes Work - Veritasium
Biggest Ideas in the Universe – Sean Carroll
How a quartz watch works - its heart beats 32,768 times a second (video)
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