- If Earth is round, why don't people on the other side of the world fall off? (see page 26)
- Is Mars red because it's embarrassed? (see page 49)
- If black holes are invisible, how do we know they're there? (see page 86)
- If Earth is round, why don't people on the other side of the world fall off? (see page 26)
- Is Mars red because it's embarrassed? (see page 49)
- If black holes are invisible, how do we know they're there? (see page 86)
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