Roulette has challenged the minds of countless gamers throughout history. Roulette was created in Paris in the 18th century ...

The final effect of being an RGB glowing ball is nice, but we’re fascinated with the structure. There are tons of great detailed pictures of the assembly on the forum thread to feast your eyes on.

Inside that second wheel is a free-spinning handle that you can grip onto. The handle spins on a set of ball bearings inside the circle and doesn’t actually control the direction of the car at all.

Dr. Rod Cross, an avid tennis fan who earned his PhD in plasma physics from Sydney University, co-authored the book Technical Tennis: Racquets, Strings, Balls, Courts, Spin and Bounce with ...