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A demonstrator dressed as Saudi Arabian Crown Prince Mohammed bin Salman with blood on his hands protests outside the Saudi Embassy in Washington, D.C., on Oct. 8, 2018. Jim Watson/AFP via Getty Images

Why repressive Saudi Arabia remains a US ally

New treatments target different stages of COVID-19, including before patients become sick enough to need a hospital. Juan Monino via Getty Images

6 COVID-19 treatments helping patients survive

A year after it became clear that COVID-19 was becoming a pandemic, there is still no cure, but doctors have several innovative treatments. Some are keeping patients out of the hospital entirely.
The use of coal for electric power has been declining fast in the U.S. AP Photo/J. David Ake

What’s really driving coal power’s demise?

Contrary to popular belief, falling natural gas prices didn't significantly accelerate coal power plant retirements. Here's what did.
A floral scent can be enjoyable for a person, but it has an important job for the flower. Richard L. Harkess

Why do flowers smell?

Not all flowers smell good, to people at least, but their scents are a way to attract pollinators.

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