How Explosives, a Robot, and a Sled Expose a Doomsday Glacier

How Explosives, a Robot, and a Sled Expose a Doomsday Glacier

Behind her, she dragged a sled loaded with a ground-penetrating radar, which fired pulses through a thousand feet of ice and analyzed the radio waves that bounced off the seawater below, thus building a detailed image of the glacier beneath her feet.Erin Pettit leaves camp with a ground-penetrating radar in tow.

A.I. Helped Uncover Chinese Boats Hiding in North Korean Waters

A.I. Helped Uncover Chinese Boats Hiding in North Korean Waters

“Most of the vessels operating do not use this and are ‘dark,’ meaning they don’t appear in public surveillance systems, and the ones that did broadcast did so relatively infrequently,” says David Kroosdma, director of research and innovation at the international nonprofit Global Fishing Watch and coauthor of the study.

AI Helped Uncover Chinese Boats Hiding in North Korean Waters

AI Helped Uncover Chinese Boats Hiding in North Korean Waters

“Most of the vessels operating do not use this and are ‘dark,’ meaning they don’t appear in public surveillance systems, and the ones that did broadcast did so relatively infrequently,” says David Kroosdma, director of research and innovation at international nonprofit Global Fishing Watch and co-author of the study.

Ground-Penetrating Radar Mapped a Buried Ancient Roman City

Ground-Penetrating Radar Mapped a Buried Ancient Roman City

The ruins are deep underground, but a team of archaeologists from the University of Cambridge and Ghent University in Belgium have used ground-penetrating radar (GPR) to map the complete city.

The Dangers of Delaying FAA Modernization

The Dangers of Delaying FAA Modernization

Many of our air traffic controllers are relying on 50 year-old radar installations and antiquated equipment to safely guide passengers through our increasingly crowded skies.

The Physics of the Doppler Effect, Represented as Tiny Balls

The Physics of the Doppler Effect, Represented as Tiny Balls

Notice how the balls look "bunched up" on the left side of the sound source but spread out on the right side? Here is a plot of the apparent ball frequency for a source moving at 4 m/s with the ball sound speed of 10 m/s.

A New Wave of Brainy Bikes Do Everything but Ride Themselves

A New Wave of Brainy Bikes Do Everything but Ride Themselves

That follows on the release, last summer, of Fox Racing Shox’s Live Valve, an electronically controlled suspension system that reacts almost instantly to terrain, and the year before, an automatic gear-shifting mode for Shimano’s STEPS e-bike drivetrain.

Seeing hidden worlds under melting ice – Climate Change: Vital Signs of the Planet

Seeing hidden worlds under melting ice – Climate Change: Vital Signs of the Planet

OMG is a multi-pronged effort to map the underwater contours of the Greenland coast, and better understand how warming ocean waters drive melting ice. A giant leap forward came late in 2017, when NASA, the University of California, Irvine and others published high resolution maps of the bedrock and sea floor around Greenland.

Severe storms show off their “plume-age” – Climate Change: Vital Signs of the Planet

Severe storms show off their “plume-age” – Climate Change: Vital Signs of the Planet

"The plume pattern in the imagery instantly tells you without the need for radar or lightning observations or other information that these are the storms you really, really need to look out for," said Kris Bedka, an atmospheric scientist at NASA's Langley Research Center in Hampton, Virginia.