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Supersonic Flight - Sonic Booms
Video by Glenn Pew (http://www.glennpew.com/) for AVweb.com. Sound travels at about 760 miles per hour, or 340 meters per second and about 661 knots on an average day at sea level. And sometimes, you can almost see it. Going close to that speed through air can cause some unusual visual effects. This compiled footage includes F-14s, standard and Blue Angels F-18s, plus the SR-71 and an Atlas Rocket launch. AVweb contacted sources at NASA to research the phenomena.
Added: 22nd February 2013
Views: 9840
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World's Best Heat Shield is 99.8 Air
We put aerogel to the test vs 'not-a-flamethrower', a huge 2000 flame to a large fiberglass blanket infused with silica aerogel - formerly the lightest solid (that title is now held by graphene aerogel).

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Try the Worlds Most Expensive Potatoes
How much would you realistically pay for a pound of potatoes? A few dollars? Well, you won’t believe how much these expensive spuds once fetched at auction. These artisanal vegetables are grown in sandy soil fertilized by seaweed on an island off the Atlantic coast of France.

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