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A Physics Lesson: Why Cats Land on Their Feet (Usually)

Why do cats (usually) land on their feet? In the six-minute video below, missile engineer and last-name-avoider Destin explains...and includes some real stunt-cat dropping photographed with a high-speed camera. He also has archival footage of Air Force researchers dropping cats on parabolic flights, which helps explain the physics behind the phenomenon. As far as I can tell, no cats were harmed in the making of this video -- though they seemed, at the very least, displeased.

For some deeper math, check out the paper Gauge Theory of the Falling Cat (PDF) by Richard Montgomery. Warning: it involves differential equations.

See also: The Buttered Cat Paradox and Feline Physics: Why Cats Can Survive Falls From Great Heights.

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science
Why Are Glaciers Blue?
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The bright azure blue sported by many glaciers is one of nature's most stunning hues. But how does it happen, when the snow we see is usually white? As Joe Hanson of It's Okay to Be Smart explains in the video below, the snow and ice we see mostly looks white, cloudy, or clear because all of the visible light striking its surface is reflected back to us. But glaciers have a totally different structure—their many layers of tightly compressed snow means light has to travel much further, and is scattered many times throughout the depths. As the light bounces around, the light at the red and yellow end of the spectrum gets absorbed thanks to the vibrations of the water molecules inside the ice, leaving only blue and green light behind. For the details of exactly why that happens, check out Hanson's trip to Alaska's beautiful (and endangered) Mendenhall Glacier below.

[h/t The Kid Should See This]

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Space
New Jersey Is Now Home to the Western Hemisphere's Largest Planetarium

Space-loving tourists often travel to Manhattan to visit Hayden Planetarium at the American Museum of Natural History. But starting December 9, they’ll be able to get their fill of stars and planets in nearby Jersey City. As Astronomy reports, New Jersey’s second-most-populous city is now home to the largest planetarium in the Western Hemisphere, and the fourth largest in the world.

The Liberty Science Center in Jersey City, an interactive science museum in Liberty State Park, opened in 1993. It’s home to 12 museum exhibition halls, aquariums, a live animal collection, and an IMAX dome theater. On July 31, 2017, the theater was closed for extensive renovations, thanks to a $5 million gift from an altruistic former high school teacher-turned-philanthropist, Jennifer Chalsty, who’s served as a science center trustee since 2004.

Renamed the Jennifer Chalsty Planetarium, the IMAX theater received a digital upgrade and a brand-new screen, and was provided with the requisite technology to serve as a planetarium. The theater’s dome is 60 feet high, with a diameter of 89 feet, and its 10-projector system broadcasts onto a 12,345-square-foot domed screen.

There are only three planetariums in the world that are larger than the Jennifer Chalsty Planetarium, and they’re all located in China and Japan. “You can fit any other planetarium in the Western Hemisphere inside the Jennifer Chalsty Planetarium,” said Paul Hoffman, the science center's president and CEO, in a press release. “Add in the state-of-the-art technology and you have a spectacular unique theater like none other in the world. Visitors will be able to fly through the universe, experience the grandness and vastness of space, roam planetary surfaces, navigate asteroid fields, and watch the latest full-dome movies."

[h/t Astronomy]

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