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Scientists have uncovered fossils of a giant rodent that lived in Thailand 34 million years ago, revealing that enormous rodents evolved much earlier than previously thought. Named Yakamys sirindhornae, the ancient animal may have weighed around 66 pounds, roughly twice as much as other known rodents of its time.
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Even when bad cholesterol is brought down to healthy levels, some people remain at risk of heart attacks, and scientists may have discovered why. Researchers identified two types of fat-carrying particles that appear to promote inflammation and damage blood vessels through mechanisms beyond cholesterol buildup.
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A bizarre, heavily armored amphibian roamed the oceans 237 million years ago, despite the fact that modern amphibians cannot survive entirely in saltwater. Discovered in China, the giant salamander-sized creature may be the first known amphibian to have adapted to a fully marine existence.
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After more than a year of simulated life on Mars, four NASA volunteers have finally emerged from isolation, bringing a remarkable space exploration experiment to an end. Their experiences growing food, conserving resources, and overcoming Mars-like challenges could help NASA prepare for humanity's future on the Moon and Mars.
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NASA is putting $500,000 on the line in a new competition to accelerate the development of advanced electric rocket engines for satellites and future space exploration. The AMPERE Challenge will reward up to two U.S. companies with cash prizes and access to NASA testing facilities to help bring promising propulsion technology closer to real-world missions.
