Titanium is fantastically expensive, and difficult to fabricate, relative to other materials—meaning it was only ever practical to use on the world’s fastest plane.

A time capsule is going into the ground in Washington D.C. to mark the 250th anniversary of America’s independence. It’s no ...

Abstract: Given that emotional content spreads more widely than rational content in social networks, as well as the complexity of user cognition and the interaction of derivative topics, this article ...