La Presse 1836 paid advertisements lower price

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Paid ads helped make newspapers cheaper

In 1836, the French newspaper La Presse began carrying paid advertisements. The money from ads let the paper lower its price, reach more readers, and become more profitable. Other newspapers soon copied the model.

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Both sides of the Moon get sunlight

The Moon’s far side is not always dark. The Moon rotates as it orbits Earth, so sunlight reaches both sides. A full cycle of lunar day and night lasts about 29.5 Earth days.

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≈5 billion years

The Sun will become a red giant

When the Sun’s core exhausts its hydrogen, the Sun will expand into a red giant. Mercury and Venus will be vaporized, while Earth and Mars will become uninhabitable; Earth may also be destroyed.

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