Mars had an oxygen-rich atmosphere around 4 billion years ago
13
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
34
Your thumb is about the same size as your nose.
124
A cow produces around 200,000 glasses of milk in her lifetime.
373
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81