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Curiosities: How many people can the Earth support?
It depends on the kind of lifestyle those people enjoy, says Lisa Naughton, a UW–Madison professor of geography and environmental studies. The late 18th…
Wielding microbe against microbe, beetle defends its food source
As the southern pine beetle moves through the forest boring tunnels inside the bark of trees, it brings with it both a helper and a competitor. The helper is a fungus that the insect plants inside the tunnels as food for its young. But also riding along is a tiny, hitchhiking mite, which likewise carries a fungus for feeding its own larvae.