Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
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Re:
Jokes
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World's Dumbest Inventions
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2010-10-16 14:44:53
Mercury
How about a solar-powered flashlight?
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