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Milwaukee's voucher program serves some 28,000 students. Most of them are African-American and come from low-income families.

This new knot has eight crossings, far more than previous molecular knots. The "rope" is very short — just 192 atoms long, or 500 times smaller than a red blood cell.

Tennessee becomes the latest reason to doubt much-touted improvement in the nation's high school graduation rate.

German alchemist Hennig Brand started with about 1,500 gallons of urine in his 17th century hunt for gold. Discovering phosphorus was just a nice surprise. Know a modern tale of scientific luck?

Do cities destroy nature or are they part of nature? Astrophysicist Adam Frank looks at a new book attempting to answer that question — which he says could be a key to our collective future.

Danish Foreign Minister Anders Samuelsen says the new diplomatic post is a nod to the digital world's impact on people's day-to-day lives, which he says is greater than most nations' impact.

The review will go all the way back to the 2008 campaign and will look at "all foreign actors and any attempt to interfere with our elections," said White House spokesman Eric Schultz.

The city as a classroom — that is the vision behind LRNG, a new online platform that connects people to informal learning experiences in their communities.

Genetic sequencing company Illumina says within three to 10 years, their new machines will bring down the baseline cost of sequencing a human genome from about $1,000 to $100.

The Senate confirmation process for President Trump's Cabinet picks has been unusually slow. Trump blames Democrats; Democrats say they are pushing back against "unqualified" nominees.