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A video screenshot shows a robot boat packed with explosives just moments before it strikes a Saudi missile frigate and explodes on Jan. 30, 2017. Credit: USNI News A suicide boat attack that killed two sailors aboard a Saudi warship was apparently carried out by an unmanned, remotely-controlled boat. The U.S. Navy says the incident likely represents the first ever use of a suicide robot boat as a weapon on the high seas. Suicide boat bombings carried out by human crews willing ...read more

(Credit: Cylonphoto/Shutterstock) When a meteor screams through our upper atmosphere, it’s a silent show for us here on the ground. Most meteors burn up dozens of miles above the surface, and even if a sonic boom reaches us it comes minutes after the visual spectacle. However, reports of meteors have for years been accompanied by reports of strange sizzling sounds filling the air, as if someone was frying bacon. Sound travels too slowly for the meteor to be directly responsible for the p ...read more

(Credit: Brittney Tatchell/Smithsonian Institution) Unearthed in 1996 after part of his skull was found along the shores of the Columbia River in Washington, Kennewick Man, a 9,000-year-old Paleoamerican, would soon be regarded as the most important human skeletal discovery in American history. A Crisis of Ancient Identity When two college students reported that they had found a skull fragment in the river, scientists responded quickly. After searching for and collecting nearly 300 other ...read more

The supermassive black holes found at the centers of galaxies are known for their extreme X-ray emission. This emission is associated with the massive hot disks of gas and debris that circle these monstrous black holes before it is consumed. However, X-ray observations of distant galaxies have also uncovered additional luminous X-ray sources that aren’t associated with the galactic centers (where supermassive black holes are found). These are ULXs, or ultraluminous X-ray sources. ULXs hav ...read more

By Kaitlin Vortherms When smog is so thick that it clouds our vision, we can see and acknowledge that air pollution is a problem. In December of last year, China issued its second ever red alert, their highest rating for air pollution, and last month, London broke modern air pollution records. But on days when the haze has lifted, we tend to forget air pollution is still there. More to the point, we forget about how air pollution affects our health and the environment. It’s out of sight, a ...read more

Pueblo Bonito taken from the northern rim of Chaco Canyon, New Mexico. (Credit: Douglas Kennett, Penn State University) Before they disappeared in 1130, the Chacoans of New Mexico were a society on par with the Mayans. Without a writing system to speak of, they maintained complex trade partnerships with nearby populations. They lived in sprawling, complex stone mini-cities called “great houses”—the largest of which, Pueblo Bonito in Chaco Canyon, boasted 650 rooms. They ...read more

(Credit: Shutterstock) If you have ever been nervous about something that is about to happen, then you may have felt the sensations of nausea and “fluttering”—the recognizable and odd sensation deep in your gut known as having “butterflies in the stomach.” Perhaps you were about to give a speech to a large audience, were in the waiting room for a big interview, were about to step up and take a key penalty shot or about to meet a potential love interest. Rather tha ...read more

A river of moist air hits Western Europe during Storm Desmond in 2015. (Credit: Wikimedia Commons) Rivers in the sky may be responsible for up to 75 percent of the largest, most extreme wind and rainfall events that ravage the coasts. The streams of moisture, called atmospheric rivers, originate in the tropics and often stretch for thousands of miles across the ocean in a thin band. They deliver a deluge of rain that causes major floods, landslides and a rash of insurance c ...read more

Yes, this cephalopod is looking at you funny. It’s a kind of cockeyed squid—an animal that looks like some jokester misassembled a Mr. Potato Head. One of the cockeyed squid’s eyes is big, bulging and yellow. The other is flat and beady. After studying more than 25 years’ worth of undersea video footage, scientists think they know why. The Monterey Bay Aquarium Research Institute (MBARI) in California has been dropping robotic submarines int ...read more