The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Yawns are more contagious among people with closer relationships.
163
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Human hair and fingernails continue to grow after death.
7
Our Right Lungs takes more air than our left lung.
194
On average, there's 100 billion neurons in the human brain.
83