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Hydrogen is built into helium at a temperature of millions of degrees. NASA/SDO (AIA)

Before fusion: a human history of fire

Fire has played a vital role in human history, and will continue to. Recent advances in fusion herald the freeing of fire from captivity back into its natural form.
Half Dome, Yosemite National Park. Lorcel/Shutterstock

How John Muir’s incessant study saved Yosemite

John Muir, born on April 21, 1838, was one of America’s first great conservation advocates. His letters and diaries convey the emotions Muir felt in Yosemite Valley, his ‘sanctum sanctorum.’
We need other species to survive for the services they provide and the knowledge they can share. Global Environment Facility

Why we need a ‘moon shot’ to catalogue the Earth’s biodiversity

The presidential candidates should be talking about exploring and cataloguing our biosphere, which holds vital clues for how humanity should navigate the future.
A man receives dental treatment at Care Harbor LA, a free medical clinic in Los Angeles, California, October 31, 2013. Lucy Nicholson/Reuters

The cavity in health insurance coverage: oral health

The absence of comprehensive dental care exacts a toll on millions of Americans in terms of poor health, pain and the social stigma associated with bad teeth.
Where in the world do you put 4.8 million displaced people? Muhammad Hamed/Reuters

Where have 4.8 million Syrian refugees gone?

As part of a collaboration between The Conversation and PBS’s Point Taken, a professor from The Ohio State University examines some common misconceptions about Syrian refugees.