Science & Technology

There's plenty of evidence that the climate has warmed up over the past century, and climate scientists know this has happened throughout the history of the planet. But they want to know more about how this warming is different.

Now a research team says it has some new answers. It has put together a record of global temperatures going back to the end of the last ice age — about 11,000 years ago — when mammoths and saber-tooth cats roamed the planet. The study confirms that what we're seeing now is unprecedented.

The educational division of the media conglomerate News Corp., called Amplify, unveiled a new digital tablet this week at the SXSW tech conference in Austin, Texas, intended to serve millions of schoolchildren and their teachers across the country.

Amplify promises the tablet will simplify administrative chores for teachers, enable shy children to participate more readily in discussions, and allow students to complete coursework at their own pace while drawing upon carefully selected online research resources.

Who knew that the flower nectar of citrus plants — including some varieties of grapefruit, lemon and oranges — contains caffeine? As does the nectar of coffee plant flowers.

And when honeybees feed on caffeine-containing nectar, it turns out, the caffeine buzz seems to improve their memories — or their motivations for going back for more.

"It is surprising," says Geraldine Wright at Newcastle University in the the U.K., the lead researcher of a new honeybee study published in the journal Science.

For more than a century, neurons have been the superstars of the brain. Their less glamorous partners, glial cells, can't send electric signals, and so they've been mostly ignored.

When the streaming video service Netflix decided to begin producing its own TV content, it chose House of Cards as its first big project. Based on a BBC series, the show stars Kevin Spacey and is directed by David Fincher, and it has quickly become the most watched series ever on Netflix.

Scientists are beginning to understand how people tune in to a single voice in a crowded, noisy room.

This ability, known as the "cocktail party effect," appears to rely on areas of the brain that have completely filtered out unwanted sounds, researchers report in the journal Neuron. So when a person decides to focus on a particular speaker, other speakers "have no representation in those [brain] areas," says Elana Zion Golumbic of Columbia University.

An estimated 3.5 million Americans suffer from low vision, but Saturday’s Low Vision Expo offers new information and technologies that can help people who have given up their favorite hobbies or activities.

Dr. Sandra Fox, assistant professor of ophthalmology at the UT Health Science Center, said a low-vision therapist can help patients find the right tools, lighting and working distance to see better for the hobbies or tasks they want to perform.