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Climbers Tommy Caldwell and Kevin Jorgeson finished their historic first free climb on El Capitan's Dawn Wall in Yosemite National Park. Melissa Block talks with the duo about their 19-day effort.

A committee of experts examined about a dozen different synthetic biology technologies that could be potentially misused. For each, they considered how likely it was to be usable as a weapon.

Michael Honeycutt, the top toxicologist for Texas, is the latest chair of the EPA's science advisory board. But some scientists warn his views align more with industry than with scientific consensus.

Kim Wyman vigorously pushed back against President Trump's unfounded claims of voter fraud and is widely seen as a mail-in ballot and security expert. She'll start her new role on Nov. 19.

In response to a lawsuit from environmentalists, the Biden administration is ending new leases for coal mining on federal lands in the most productive part of America's top coal producing state.

The militant group confirmed the death of its longtime leader Hassan Nasrallah in Beirut. The development marks a significant escalation many fear is inching towards a larger regional war.

DeSantis has made the culture wars central to his political identity — and intends to run that way in the GOP primary for president.

Parliamentary elections were postponed several times amid disputes over the election law and procedures.

The hearing, when rescheduled, could conclude its presentations of investigative findings before a final report due later this year.

Foresters responding to climate change are experimenting with planting trees in Vermont that typically are found further south. They hope the trees will survive hotter and drier conditions to come.