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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.

A mutual fund pools money from many investors to buy a diversified portfolio of assets. Here is how mutual funds work, their types, costs and trade-offs.

Renewable energy comes from sources that nature replenishes on a human timescale, such as sunlight, wind and water. Here is how it works and why it matters.

A referendum is a direct popular vote on a single question or proposal. Here is how referendums work, the types that exist, and what makes them binding.

A false positive is a test result that says something is present when it is not. How it happens, and how it ties to sensitivity and specificity.

CSS is the language that styles web pages, controlling colour, layout and typography separately from the HTML content. Here is how it works and why it matters.

A recession is a significant, broad decline in economic activity lasting more than a few months. Here is how it is defined, measured and what causes one.