In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
Cows can sleep standing up, but they can only dream lying down.
745
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
You forget 90% of your dreams.
256
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The largest breed of rabbit is the Flemish Giant.
65
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