Science

Elliot Berman with his team at Solar Power Corporation outside their office and manufacturing facility in Braintree, Mass., in 1973. John Perlin, author of Let it Shine: The 6,000-Year Story of Solar Energy, credits Berman with planting the flag of solar photovoltaics throughout the world. Solar Power Corporation via John Perlin hide caption

After finishing up some household chores, Brody Knapp gets a chance to play with his mother, Ashley, at their home in Kansas City, Mo. Alex Smith/KCUR hide caption

U.S. adults put on about a pound a year on average. But people who had a regular nut-snacking habit put on less weight and had a lower risk of becoming obese over time, a new study finds. R.Tsubin/Getty Images hide caption

A team of scientists used a telescope at the Calar Alto Observatory in Spain to detect a gas giant orbiting a tiny red star some 30 light-years from Earth. Baback Tafreshi/Science Source/Getty Images hide caption

Triathletes who trained too much chose immediate gratification over long-term rewards, researchers found. Markus Büsges/EyeEm/Getty Images hide caption

Salmon swim upstream in Seattle in 2017. A mass of abnormally warm water off the west coast of the U.S. that year contributed to a federal fishery disaster. Warming oceans and rising sea levels are threatening coastal economies as the world's climate changes. Elaine Thompson/AP hide caption

Ruby Johnson, whose daughter was recently hospitalized with a respiratory illness from vaping, testified before a House Oversight subcommittee hearing on lung disease and e-cigarettes on Capitol Hill Tuesday. Andrew Harnik/AP hide caption

An employee of the Boston biotech company Ginkgo Bioworks runs a gene sequencing machine through its paces. The company synthesizes thousands of genes a month, which are then inserted into cells that become mini factories of useful products. Tim Llewellyn/Copperhound Pictures/Ginkgo Bioworks hide caption