The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Our Right Lungs takes more air than our left lung.
194
Your fingernails grow faster in summer.
744
Human hair and fingernails continue to grow after death.
7
Only humans shed emotional tears.
331
The human brain uses approximately as much energy as a 10 watt light bulb.
120
On average, there's 100 billion neurons in the human brain.
83
The average person's skin weighs twice as much as their brain.
131