#archive2001q1

Stop motion Source: Not to be confused with time lapse, the combination of still photographs into a fast-moving video. A clay model of a chicken, designed to be used in a clay stop motion animation[1]

Kepler's laws of planetary motion Source: Illustration of Kepler's laws with two planetary orbits.The orbits are ellipses, with foci F1 and F2 for Planet 1, and F1 and F3 for Planet 2. The Sun is at F1.The