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On New Year's Day, Jair Bolsonaro will be sworn in as president. He's an admirer of Donald Trump, and his rise to power has created — and reflected — deep divisions among Brazilians.

Active shooter drills are one way schools prepare for possible shootings. Now a new report underlines a method for prevention: threat assessment, along with social and emotional support for students.

In format and style, the second CNN debate was almost a clone of the first. Once again, the emphasis was on finding points of contention and stoking the tension between candidates.

A ship of researchers is crossing the Arctic for a year attached to an ice floe. But finding the right chunk of sea ice was a challenge, in part because warmer temperatures are making it thinner.

Coral reefs are in trouble worldwide, from a host of threats, including warming ocean temperatures, nutrient runoff and increasing ocean acidity. A noted climate scientist from California has been conducting an experiment on Australia's Great Barrier Reef to see whether antacid could boost coral growth.

About 1 in 5 teens may have contemplated suicide. But new research suggests that schools as a whole can make a difference.

Adele swept the major categories over Beyoncé, David Bowie posthumously won every award he was nominated for and the Grammys sometimes obliquely addressed a charged political climate.

After a two-hour phone call with his Chinese counterpart, President Biden made his case for domestic investment in infrastructure, clean energy and other sectors.

Environmental writer Oliver Milman says habitat loss, pesticides and climate change are killing off insects worldwide, which, in turn, threatens humans. His new book is The Insect Crisis.

History has many lessons to offer on how much it will cost to rebuild Ukraine, and how it can be done to help set the country up for a more prosperous and safe future.