Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
By weight, Bone is five times stronger than steel.
417
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 person will create enough saliva to fill two average size swimming pools during his lifetime.
191
There are about 255 babies born worldwide every minute.
46
Yawns are more contagious among people with closer relationships.
163
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11