Slow motion pictures ... what happens as a drop of fluid hits a surface. And one particularly stubborn aspect—why do you get lift-off (a precursor to a splash) near the end of the impact?— ...

Dr James Sprittles from the Mathematics Institute has created a new theory to explain exactly what happens -- in the tiny space between a drop of water and a surface -- to cause a splash.

The Apple Watch, which can be worn while swimming and doing other water-based activities, has a neat feature that's designed to use the speakers to eject water, protecting the internal components.