What is the formula for calculating the distance between two points in 3 coordinate space?
  Space Between   and told to place them apart, at random positions. They are allowed to change their mind and the positions as often as they like. When they are satisfied, the distance between the two objects is precisely measured, using a standard tape measure. The length is announced out loud. You recap what they did, explaining there are thousands of possible outcomes. Then the prediction envelope is opened, and the number written down is the EXACT measurement that the spectator just called out! …
