A healthy heart beat lasts about 1 second.
On average, Americans eat 350 slices of pizza every second.
Every second the Earth travels 30km, the sun in the same second Travels 274 Km.
Traditionally, the second was the 60th part of the 60th part of the 24th part of a day, but science has given it a more precise definition: it is the duration of 9,192,631,770 cycles of one tyype of radiation produced by a cesium 133 atom.