Your thumb is about the same size as your nose.
124
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
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The idea of left brain (logical) and right brain (creative) has no basis in neuroscience and is in fact a myth.
16
In one day, adult lungs move about 10,000 litres of air.
11