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President-elect Donald Trump spent the weekend trying to figure out the rest of the key positions for his administration, while President Obama finished his last overseas trip in Lima, Peru.

Each lab-grown cluster of human cells fits on a pin's head, but contains some of the cell types and circuitry of a real brain. The structures already are offering insights into how Zika attacks.

The way animals are transported and slaughtered for the major Muslim holiday has health officials concerned about the threat of Crimean-Congo hemorrhagic fever.

Hillary Clinton's efforts to humanize herself and make an affirmative case for her candidacy has been complicated by a case of pneumonia and her comments about Donald Trump's supporters.

The president-elect also formally introduced retired Marine Corps Gen. James Mattis as his pick to lead the Defense Department. Congress is also moving to fast-track a waiver he needs to be confirmed.

NPR has confirmed that intelligence officials say it's now "quite clear" Russian hackers worked to tip the presidency in Donald Trump's favor. Trump's transition team has dismissed the assessment.

Searching for alien life is harder than you might think, because whatever is out there might be really odd. So leading astrobiologists are meeting to advise NASA on how to go about looking for it.

A gene-editing technology called CRISPR-cas9 could be a gold mine for its inventors, but it's not clear who owns the idea. U.S. patent judges will soon hear oral arguments to decide the issue.

Mae Reeves was one of the first African-American business owners in Philadelphia, where she designed hats for Ella Fitzgerald, Lena Horne and Marian Anderson.

The election countdown is on — so we've rounded up the education talking points of each candidate in case you have last-minute questions.