Rip off: Why does newspaper always seem to have a preferential direction
for tearing? It looks homogeneous to the naked eye. Other sorts of paper, such
as A4 laser printer paper, seem homogeneous in appearance and in tearing.
Meltdown: The chocolate chips in a biscuit do not appear to melt when
cooked in the oven at 150 掳C, but melt when left in the sun. Why?
Cloud line: Why do most clouds have defined edges (or at least appear to
have)?
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