The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Your body is creating and killing about 2.4 million red blood cells per second.
17
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
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