Mars had an oxygen-rich atmosphere around 4 billion years ago
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Lurch, a Watusi bull, had the largest horns in the world.
32
If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31
Your thumb is about the same size as your nose.
124
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3