rope swing record

does the period of a pendulum depend on its mass?

Time-Lapse: Lose Yourself in the Night Sky

fastest response time

The kangaroo rat’s escape response to a snake attack is less than 70 milliseconds and the quickest mammalian startle response.

Selected solar system objects to scale in size, rotation speed and axial tilt

Milky Way and Earth

Milky Way spinning around Earth

Milky Way fixed, earth spinning round

The Milky Way Fly Out

Stefan Payne-Wardenaar

Least action, path of bowling ball minimizes action

A free-falling frame of reference cancels gravity

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Mesmerising Mass Sheep Herding

Solar eclipse from space

150 Ton Hydraulic Guillotine Vs Deck of Cards