Paragraph 2
In 1999, an Egyptian won the Nobel Prize in Chemistry for measuring the
at which molecules change their shape. He found that
femtosecond equals 0.000000000000001 seconds, or a
of a billionth of one second. The zeptosecond measures
in terms of the speed of
. One millisecond is a thousandth of one
. This is the
it takes a neuron in our brain to fire. One nanosecond is one
of one second. The shortest unit of time it may be
to measure is one Planck. This is a decimal
followed by 44 zeros and a 1.
