24: Number of microseconds (thousandths of a second) it takes for a stick of dynamite to explode after its fuse has burned down

1: Number of feet a beam of light shining through a vacuum will travel in a nanosecond (a billionth of a second)

200: Number of femtoseconds (millionths of a billionth of a second) it takes for light to interact with a retina

1: Estimated number of attoseconds (billionths of a billionth of a second) it takes for an atomic nucleus to recoil

Sources: Scientific American: A Matter of Time; wikipedia.org