They're listed as seasonal tourist attractions in some towns. I remember being a kid and my parents taking me, as part of a vacation, to a place with nearby woods that had butterfly swarms resting on them. I think we missed the main swarming times, but we did see quite a few clinging to the trees.

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Your Alchemy Project for the Weekend

It always pleases me when I find science projects that I haven't done yet. This one, which allows people to use a couple of kitchen ingredients and a few pennies to make copper plating, seems especially promising. Just a little vinegar and you can feel like an old-fashioned alchemist.

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Geology is what we look to when we want enduring monuments. Rock and metal outlast anything made of living tissue. Or do they? In another example of science getting poetic, it seems that a symbol of ephemera — a butterfly — provides evidence of a mountain long turned to dust.

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The effect that explains why you regret posting in anger

Ever come across one of your old angry Internet comments and cringed with disbelief? There's a reason for that. While good feelings still feel immediate over time, negative ones tend to fade away quickly, leaving only angry tweets behind.

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