1.A Mars-sized object crashed into Earth 4.5 billion years ago, chipping off a chunk of rock that became the moon, and making the Earth’s axis tilt slightly.2. 111,111,111 × 111,111,111 = 12345678987654321.3. Our first ancestor to walk on land was a four-legged fish called Tiktaalik.4. Teenage brains really are different to adult ones.5. There are roughly …
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