When was it first realised that the lit portion of the moon always faces the sun, so moonlight must be reflected sunlight?
Andrew Taubman,
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Sydney, Australia
In the comics, Thor spins his hammer very fast and hurls it into the air, allowing him to be pulled into flight. Could you make a machine that 鈥渇lew鈥� using such a principle?
Paul Gray,
Hertfordshire, UK
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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