How Benjamin Franklin showed that dark colors absorb more heat

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Black cloth melted deepest into snow

Benjamin Franklin placed differently colored cloth on snow in sunlight. The black cloth melted its way deepest, showing that darker surfaces absorb more heat than lighter ones.

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Drug-resistance genes can spread between different bacteria

Bacteria can pass genes for drug resistance to other bacteria, even to different species. This lets resistance spread much faster than it would through reproduction alone.

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Wildebeest migrate thousands of kilometres for food and water

~2 million each year

Huge herds of wildebeest migrate between Tanzania’s Serengeti and Kenya’s Masai Mara in search of food and water, traveling roughly 2,900 kilometres along their annual route.

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