How fish vision changes with water depth

Fish eyes change with water depth

Water removes red and other long wavelengths of light faster than shorter ones, so the color of available light changes with depth. Many fish have vision tuned to the light found where they live. This link between depth and vision is much weaker in animals that live on land.

Earth's atmosphere is a shield against cosmic X-rays

X-rays from space are absorbed high in Earth's atmosphere, long before they can reach the ground. This protects life from much of the universe's high-energy radiation, but it also hides X-ray sources from ordinary observatories. To observe black holes, neutron stars and other X-ray-emitting objects, astronomers must send their detectors above the atmosphere.

Participants obeyed despite believing they caused harm

In the Milgram obedience experiment, ordinary American participants followed an authority figure’s orders even when they believed they were causing an innocent person severe suffering or apparent death.

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How fish vision changes with water depth

Fish eyes change with water depth

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