World
Why exchange rates move a little every day
An exchange rate is simply the price of one currency in another, and like most prices it changes when supply and demand change.
The news in 40 words
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World
How the UN Security Council actually makes decisions
The Security Council is the part of the United Nations that can make decisions member countries are expected to carry out. There are 15 members: five permanent ones and ten elected for two-year terms by the General Assembly.
World
Why some countries use half-hour time zones
Most of the world sets clocks in whole hours from Coordinated Universal Time, but a handful of places use half or quarter hours. Time zones are meant to keep midday roughly when the sun is highest.
World
What a trade bloc is, and why countries join one
A trade bloc is a group of countries that agree to make trade between them easier than trade with everyone else. The simplest blocs cut or remove tariffs on goods moving between members.
World
What the G20 is and what it can actually do
The G20 is a forum where the largest economies meet to talk about growth, trade, debt and other shared problems.
Climate
Why sea levels don't rise evenly around the world
Global average sea level is rising, but what a particular coastline experiences can be quite different. Large ice sheets pull water towards them; as they melt, that pull weakens and water redistributes.
World
How countries protect animals that migrate across borders
Many animals travel huge distances every year, crossing borders that mean nothing to them. A species protected in one country can still be hunted or lose its habitat in the next, so one country's rules are rarely enough.
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