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What can happen in just a second,
a minute, or an hour?
How can we measure time?
The flap of a vulture’s wing.
A crocodile’s heartbeat.
The weight of a baby blue whale.
The life of a mayfly.
These increments of time may sound a bit strange, but they are all fascinating ways in which we can think about time.
But what exactly is time?

40 pages
HMH Books for Young Readers
2011

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