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Most healthy adults need at least seven hours a night. The number shifts with age, and the quality of the evidence is better than you might think.

The word "bestseller" has no single legal definition, and what counts depends entirely on which list is doing the counting.

Inside the photovoltaic effect: how a slab of treated silicon converts light into usable electric current, with no moving parts.

Joining the EU is a long, structured process built around democratic standards and adopting the bloc's entire body of law, chapter by chapter.

An initial public offering is the first time a private company sells shares to the public. The reasons behind it reveal how companies raise money.

The cloud is not in the sky. It is rooms full of computers in buildings around the world, and someone else owns them.

If the universe were infinite and eternal, the night sky would blaze. Its darkness is a clue about cosmic age, light's finite speed, and expansion.

Body mass index is a simple, useful population screen — but it was never meant to diagnose any one person's health, and it can mislead.

Streaming has become the music industry's largest revenue source, but the path from a subscription fee to an artist's account is long and shared.

Buying a credit to cancel out emissions sounds simple — but the value of an offset depends on claims that are hard to verify.