Many people will see a dazzling eclipse this April, but these events are possible only because of the sizes and precise distances between Earth, the Moon and the Sun.
What can we do as individuals to help save the planet? Acting locally is satisfying because we can see the results, but a geographer argues that large-scale solutions often make the most difference.
Scientific advances – including the recent discovery of gravitational waves – force us to deal with numbers so extreme they’re virtually inconceivable.