Buck Rogers

It only ran for two and a half seasons from 1981 to 1983, but The Greatest American Hero—starring William Katt as an unassuming teacher who receives a super-powered suit from aliens, then promptly loses the instructions—has left an indelible mark on pop culture. You probably already have the theme song stuck in your head (“Believe it or not, I’m walking on air...”) after just reading the headline on this post.Chris Pratt and Bryce Dallas Howard Nerd Out About Jurassic Park's Returning HeroesWhy has The Greatest American…

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SLS on the launch pad at Kennedy Space Center in Florida. Photo: NASANASA’s Space Launch System is powered by a mixture of liquid hydrogen and liquid oxygen. Together, these elements provide for a compact and extremely powerful rocket propellant, but these same attributes are also what make this fuel a liability. The second launch attempt of SLS had to be called off on Saturday, September 3, after engineers failed to resolve a hydrogen leak in a quick disconnect—an 8-inch inlet that connects the liquid hydrogen fuel line…