Humans may have saved pumpkins, squashes and gourds from an Ice Age extinction, researchers say online November 16 in the Proceedings of the National Academy of Sciences,
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. Genetic analysis of 91 ancient and modern gourds (Cucurbita sp.) suggests that people began cultivating the plants nearly 10,
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,000 years ago.
Wild gourds are very bitter, so the team tested genomes from 46 modern mammals for a gene related to tasting bitterness. Smaller mammals had more copies of this gene, suggesting that ancient small mammals probably rejected the fruit,
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, while megafauna like mastodons helped spread early Cucurbita seeds.

Nothing lasts forever,
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, although some things seem to. Speeches at political conventions, the NBA play-offs and those fight scenes in the Matrix movies just go on and on and on. Sometimes life itself seems like one never-ending wallpaper pattern,
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, duplicated over and over again at regular intervals.

Whether life is really like that or not,
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, lots of other things are. Take crystals,
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, regular organizations of atoms assembled in repeating patterns. Snowflakes,
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, for instance, are a particular type of ice crystal, with six identical arms. Turn a flake by one-sixth of a full rotation and it looks the same as before. In other words, snowflakes exhibit symmetry in space.

Of course, simpler

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