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In his lab at George Mason University in Virginia, Sean Luke has all kinds of robots: big ones with wheels; medium ones that look like humans. And then he has a couple of dozen that look like small, metal boxes.

He and his team at the Autonomous Robotics Lab are training those little ones to work together without the help of a human.

In the future, Luke and his team hope those little robots can work like ants — in teams of hundreds, for example, to build houses, or help search for survivors after a disaster.

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As summer approaches, anxiety about Zika is growing in Gulf Coast states like Florida and Texas. The virus hasn't spread to mosquitoes in the region, and it may not, but experts are preparing nonetheless.

It might not have been a drone that struck a British Airways plane on April 17 after all.

British Transport Secretary Patrick McLoughlin told Parliament on Thursday that it was probably "not a drone incident," according to The Register, an online tech publication.

Its name will be "Red Dragon." And if the latest partnership between SpaceX and NASA works out, the privately funded craft will land on Mars to collect scientific data — possibly within the next two years. The plan is to use the Dragon capsule, but without a human crew.

"SpaceX is planning to send Dragons to Mars as early as 2018," the company said via Facebook Wednesday. "These missions will help demonstrate the technologies needed to land large payloads propulsively on Mars."

The extremely high-profile dispute between Apple and the FBI has ushered in a new phase in the debate over the future of secure communications. Though many Americans still struggle with the technical implications of encryption, it's now a household word.

Fraternal twins tend to run in families, and scientists think they've identified genetic variations at play. Understanding that might someday help predict who is more likely to have a risky pregnancy, and might also help treat fertility problems.

The FBI has officially decided it can't tell Apple how the agency hacked into the locked iPhone used by one of the San Bernardino attackers.

People who sustain a concussion or a more severe traumatic brain injury are likely to have sleep problems that continue for at least a year and a half.

Take a look at some lawns this spring. You might see something that looks like a crown of thin leaves and spikey, yellow flowers shooting over the grass, particularly if you live in the South. If the stems are triangular, you've just found a sedge. Dig it up. If it's the right kind of sedge, clinging to the roots will be a few chewy, brown, marble-sized tubers called tiger nuts.

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