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An experimental technique called optogenetics is starting to change the way researchers look at the brain. The tool allows them to switch entire brain circuits on and off using light, and may help figure out what's going wrong in brain ailments from epilepsy to depression.

Donald Trump has said he doesn't need donors' money. But as he pivots to the general election, Trump is more focused on raising campaign cash — as well as polling and policy.

Day after day, there is less food on the shelves, less power to turn on lights or run businesses and more anger over the difficulties. But opposition efforts to recall the president are being stymied.

The Trump Administration is using an obscure and controversial immigration law from 1952 to try to deport Pro-Palestinian activist Mahmoud Khalil.

Rio de Janeiro made a big push to provide security in its shantytowns. But some, which were touted as models, are again plagued by gang violence that has terrified residents.

North Korean leader Kim Jong Un is directly sanctioned for the first time for his role in human rights abuses.

The president pressed for political reforms such as freedom of assembly. He noted that while he was able to meet with some human rights activists on Tuesday, others were barred from attending.

A self-described "little farm girl" in the Jim Crow Era, Gladys West's complex and pioneering work for the U.S. Navy helped to improve billions of lives — and keep us from getting lost.

The U.S. military prison at Guantánamo Bay, Cuba, is ready to accept more captives who may be sent there under President Trump's newly signed order to keep the prison open.

On the anniversary of John Lennon and Paul McCartney's first meeting, revisit the church garden party that changed the course of popular music forever.