Hydrogen can be a metal, but it is only in a solid state under extreme conditions such as being in the core of Jupiter!

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The typewriter was invented in 1829, and the automatic dishwasher in 1889.

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White dwarf stars can be as small as 1,000 miles across.

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The largest island in the Mediterranean sea is Sicily.

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Saturn isn't the only planet with rings: Jupiter, Uranus and Neptune have them, too.

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Due to its size, Pluto's moon Charon is also considered to be a double dwarf planet (two planets orbiting each other), rather than a moon orbiting its planet.

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30 years ago: The computer mouse was invented.

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The Earth gets 100 tons heavier every day due to falling space dust.

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Hydrofluoric acid will dissolve glass.

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The penguin is the only bird who can swim, but cannotfly.

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