A big blog of ideas
Maybe when you hear lighter than air, the first thing that comes to mind would be a Zeppelin or an Aerogel. Well, a Zeppelin is lighter than air when the gas inside has a lower density and is trapped in a flexible membrane. The Zeppelin is not a solid. Aerogel is one example of...
Why is half the bridge gone ? Original Picture Source : Wikimedia It should look like this. Source : Wikimedia All metals used today to build structures , especially steel and Aluminum are strong but not as strong as they should be. In theory steel should be 10 to 30 times stronger than it...