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The Doppler effect is the change in a wave's observed frequency caused by relative motion between source and observer. How it works for sound, light and radar.

A hyperlink is a clickable reference that takes you from one place to another on the web. Here is how links work, how they are written, and why they matter.

An LLC is a US business structure that combines limited liability with flexible taxation. Here is how a limited liability company works and who it suits.

Herd immunity is the indirect protection from an infectious disease that occurs when enough of a population is immune. Here is how the concept works.

A tariff is a tax on imported goods. Here is how tariffs work, why governments use them, and the debate over who actually bears the cost.

A half-life is the time it takes for half of a quantity to decay. What it means in radioactivity, how it dates objects, and where else it applies.

A web browser is the software that fetches web pages and displays them on your screen. Here is how it requests, interprets and renders the pages you visit.

A hedge fund is a pooled investment fund for professional investors that uses a wide range of strategies. Here is how hedge funds work and how they differ.

A placebo is an inactive treatment with no therapeutic effect of its own, used mainly in research. Here is what it is, the placebo effect, and why trials use it.

Diplomatic immunity is a principle of international law that shields diplomats from prosecution in a host state. Here is what the Vienna Convention actually says.

Nuclear fusion is the joining of light atomic nuclei into a heavier one, releasing energy. How it powers the Sun and why it is hard to harness on Earth.

An algorithm is a finite, ordered set of well-defined steps for solving a problem or completing a task. Here is what that means and how algorithms are used.