"Ryan Prunty brings the fun with wild challenges, epic pranks, and crazy adventures alongside his friends. Get ready for nonstop laughs and surprises in every video!" Hillary Clinton breaks ...

One easy assessment is a well-known experiment known as the "ruler drop test". You'll need the assistance of a family member or friend for this one, as well as a ruler: • Sit in a chair ...

They use the ruler-drop test to measure how fast they react, and see how distractions such as doing a sum or remembering a series of letters effects their timings. The more they practice ...