Time is familiar but also a mystery, for without it all the processes in the universe could not happen. Without time, you could not move your eyes from one word to another as you read this sentence.
Time can be divided into many categories ? attoseconds, femtoseconds, picoseconds, nanoseconds, microseconds, milliseconds and seconds.
A healthy person's heartbeat lasts about one second. In the same time it takes for a heart to beat once, Earth travels 30 kilometres around the sun, while the sun travels 275 kilometres on its path through the universe. Light takes 1.3 seconds to reach us from the moon.
There are sixty seconds in one minute. In one minute a newborn baby grows about one milligram. A shrew's heart beats 1000 times. Light from the . . .
Time can be divided into many categories ? attoseconds, femtoseconds, picoseconds, nanoseconds, microseconds, milliseconds and seconds.
A healthy person's heartbeat lasts about one second. In the same time it takes for a heart to beat once, Earth travels 30 kilometres around the sun, while the sun travels 275 kilometres on its path through the universe. Light takes 1.3 seconds to reach us from the moon.
There are sixty seconds in one minute. In one minute a newborn baby grows about one milligram. A shrew's heart beats 1000 times. Light from the . . .