Gap Fill - A Zeptosecond - Level 1


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   brain      decimal      molecules      one      possible      scientist      second      shortest      time      zeros  

Paragraph 2

In 1999, a measured the speed at which change their shape. He found this was femtosecond, which is a millionth of a billionth of one . One millisecond is a thousandth of one second. This is the it takes a neuron in our to fire. One nanosecond is one billionth of one second. The unit of time it may be to measure is one Planck. This is a point followed by 44 and a 1.

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