How fast is your reaction time? How fast does the eye ... ScienceU campers find out using the "ruler test". If you know the rate of falling objects (9.8 meters per second squared) you can convert ...

As the story goes, Italian astronomer Galileo Galilei ascended the Leaning Tower of Pisa in the 16th century to drop two spheres of different masses at the same time—proving that they would land ...