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Nearly 200 nations agreed last December to the most ambitious deal to slow climate change ever. It looks very likely that the requisite number of countries will actually ratify the deal this week to make it official. That will set in motion the difficult process of making sure both rich and poor countries deliver on their promises to cut emissions of greenhouse gases.

These days, talking to a bot is commonplace: think Siri, or your chatty banking app. But you wouldn't talk to your toaster like you talk to a friend — unless your toaster had a great sense of humor.

With help from researchers at Scripps Institution of Oceanography and USC, citizen scientists in San Diego County are being trained to help document the effects of El Nino’s high tides and strong waves.

There's new and detailed data on the impact of genetically modified crops on pesticide use. Those crops replaced insecticides, and, at first, some herbicides. But herbicide use has rebounded.

Everyone has a set of genes that keeps the body on a 24-hour rhythm. As we get older, though, the main clock can malfunction. Researchers say a backup clock may try to compensate.

This back-to-school season, it's time to reevaluate a few common assumptions about how best to study. Benedict Carey, the author of How We Learn, says science shows that discipline isn't everything.

The maker of DNA sequencing equipment alleges five European companies used Illumina technology without authorization for prenatal testing.

Airs Wednesday, Nov. 4, 2020 at 9 p.m. on KPBS TV + Sunday, Nov. 8 at 9 p.m. on KPBS 2 (not available for streaming)

In the 1760s, an Italian scientist ran a sex experiment that required putting teeny trousers on some ardent male frogs. Hot guys in pants, it turns out, aren't so hot.

Jonathan Chait's essay on a pervasive dangerous online culture of political correctness nearly broke the Internet. So does the science back him up?