Becky Harlan

Volcanoes have been crucial to life on earth. Oozing lava helped form our planet's land masses. Gases from volcanoes helped create our atmosphere. But despite the growing field of volcanology, there's still a lot we don't understand about volcanic eruptions.

That's partly because volcanoes aren't easy to study. Getting the right equipment into remote locations under unpredictable circumstances can be difficult. More important, studying active volcanos can be dangerous.

In 2016, photographer Joy Sharon Yi began taking the Metro to Barry Farm, a large public housing complex in Southeast Washington, D.C., built in 1943 on the first city settlement where African-Americans could buy property and build homes after the Civil War.

In the not-too-distant future, Americans will be sharing the road with self-driving cars. Companies are pouring billions of dollars into developing self-driving vehicles. Waymo, formerly the Google self-driving-car project, says that its self-driving cars have already driven millions of miles on the open road.