Mars had an oxygen-rich atmosphere around 4 billion years ago
13
You forget 90% of your dreams.
256
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
If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31
If aliens located 60-65 million light years away from us, looked at earth through a really powerful telescope today, they would see dinosaurs!
18