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Part 2 of the TED Radio Hour episode Networks

About Wanis Kabbaj's TED Talk

Wanis Kabbaj wants traffic to flow smoothly and efficiently, like the blood in our veins. He says driverless cars may be the solution to today's highway gridlock.

About Wanis Kabbaj

What Happens When Hackers Hijack Our Smart Devices?

5 hours ago

Part 3 of the TED Radio Hour episode Networks

About Avi Rubin's TED Talk

Computer scientist Avi Rubin says all our smart devices — cars, phones, even fitness trackers — can be hacked. He warns that our network of connected technology puts us at increased risk for cyberattacks.

About Avi Rubin

Is There A Limit To How Many Friends We Can Have?

5 hours ago

Part 4 of the TED Radio Hour episode Networks

About Robin Dunbar's TED Talk

Anthropologist Robin Dunbar believes the evolutionary structure of social networks limits us to 150 meaningful relationships at a time — even with the rise of social media

About Robin Dunbar

How Do Trees Collaborate?

5 hours ago

Part 1 of the TED Radio Hour episode Networks

About Suzanne Simard's TED Talk

Ecologist Suzanne Simard shares how she discovered that trees use underground fungi networks to communicate and share resources, uprooting the idea that nature constantly competes for survival.

About Suzanne Simard

So far, more than half of all U.S. states have legalized marijuana for medical use, and eight (plus the District of Columbia) have legalized the drug for recreational use. Varieties of cannabis available today are more potent than ever and come in many forms, including oils and leaves that can be vaped, and lots of edibles, from brownies and cookies to candies — even cannabis gummy bears.

Six years ago, Don Cameron, the general manager of Terranova Ranch, southwest of Fresno, Calif., did something that seemed kind of crazy.

He went out to a nearby river, which was running high because of recent rains, and he opened an irrigation gate. Water rushed down a canal and flooded hundreds of acres of vineyards — even though it was wintertime. The vineyards were quiet. Nothing was growing.

"We started in February, and we flooded grapes continuously, for the most part, until May," Cameron says.

Tying a knot can be tricky. Just ask any kid struggling with shoelaces. And scientists have it even harder when they try to make knots using tiny molecules.

Now, in the journal Science, a team of chemists says it has made a huge advance — manipulating molecules to create the tightest knot ever.

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The Environmental Protection Agency said Fiat Chrysler violated the Clean Air Act by allegedly installing and failing to disclose software in some 104,000 cars and trucks that alters emissions.

The automaker was required by law to disclose the software to regulators during the certification process but did not do so, the EPA announced Thursday. While the agency is still investigating the nature of these devices, it said the software results in increased emissions of nitrogen oxides.

Mice that kill at the flip of a switch may reveal how hunting behavior evolved hundreds of millions of years ago.

The mice became aggressive predators when two sets of neurons in the amygdala were activated with laser light, a team reported Thursday in the journal Cell.

Menopause is a mystery to evolutionary biologists, but new insights could come from a long-term study of killer whales.

In these whales, the explanation may lie in a combination of conflict and cooperation between older and younger females, according to a report published Thursday in the journal Current Biology.

The incoming Trump administration has found a job for former New York Mayor Rudy Giuliani.

The Trump team announced Thursday that Giuliani will "be sharing his expertise and insight as a trusted friend" on cyber-security matters. Giuliani was a surrogate and adviser to Trump during the campaign. He had reportedly been under consideration for a variety of high-level posts in the new Trump administration, including Secretary of State, a job he expressed interest in. But no such high-level post was offered.

It has spent some 175 years homeless, wandering many paths of taxonomy without a single branch to call its own. In the time since it was first described, this now-extinct, cone-shaped sea creature has known a number of presumed families — from mollusks to designations much more nebulous — but the tiny hyolith never quite fit in any of them.

Sgt. Marty Tucker thinks millennials have trouble talking to strangers. Tucker runs training for the Sheriff's Office in Spokane, Wash., and he says new recruits seem inhibited when making face-to-face contacts with members of the public.

"They're so stressed out about making contact that they don't think about anything else," he says. "So they get up there, and then they'll freeze up."

It's no secret that American children have gotten heavier in recent decades.

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