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Why is space dark?

Started by Thork

Why is the Earth accelerating at9.8 metres per second?

Started by devils advocate « 1 2 3 ... 7 »

Why is there no standard map of the earth?

Started by Peter Winfield « 1 2 3 »

Why is the sun round?

Started by Thork « 1 2 3 »

Why just water?

Started by mtnman