It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Your thumb is about the same size as your nose.
124
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
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
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139