1918 Spanish flu soldiers crowded camps transport ships

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Crowded troop transport helped spread the 1918 flu

The 1918 Spanish flu pandemic spread worldwide as soldiers moved through crowded camps and transport ships with poor sanitation. It killed an estimated 17–25 million people.

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Female fireflies fake mating signals to lure males they eat

Female Photuris fireflies copy the mating flashes of another kind of firefly. Males follow the false signal and are eaten. The females also gain defensive chemicals from their prey that they cannot make themselves.

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Bacteria can make thousands of square miles of ocean glow

Thousands Of Square Miles

Some light-producing bacteria can make enormous areas of ocean glow at night, sometimes across thousands of square miles. This rare sight is known as a milky sea.

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