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Why your nose runs when it’s cold outside

A runny nose is common when we’re sick, but it can come unexpected when we’re perfectly healthy. So why do we get runny noses in the middle of summer or in the winter when we don’t have a cold? NYU otolaryngologist Dr. Erich Voigt says it has to do with […]
Why your nose runs when it’s cold outside
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A 24-year-old has a solution for one of NASA’s biggest problems

VIDEO: When it comes to sending rockets to Mars, the biggest hurdle NASA has faced is the amount of energy needed to carry a very small payload over such a long distance. But 24-year-old engineering student Gary Li believes he's found a solution with an efficient self-healing plasma rocket.
A 24-year-old has a solution for one of NASA’s biggest problems
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The physics of Captain America’s shield

VIDEO: Captain America never goes into battle without his shield. He'll throw, hurl, and pitch it against formidable enemies, but somehow the shield seems always returns to the hero's side. Is it just Marvel magic, or is it clever physics?
The physics of Captain America’s shield
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The US military’s decades-long search for the smelliest weapon in the world

VIDEO: The US military has been attempting to use terrible smells as non-lethal weapons as far back as World War II. We spoke with science writer Mary Roach about the military's decades-long search for the world's worst odor. You can read more fascinating stories about humans at war in Roach's new book, "Grunt: The Curious Science of Humans at War."
The US military’s decades-long search for the smelliest weapon in the world
Video

How the ancient Greeks proved Earth was round over 2,000 years ago

In the mid-20th century, we began launching satellites into space that would help us determine the exact circumference of the Earth: 40,030 km. But over 2000 years earlier, a man in Ancient Greece came up with nearly the exact same figure using just a stick and his brain. Following is […]
How the ancient Greeks proved Earth was round over 2,000 years ago
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