Roman Concrete

An older piece of news, but fascinating, about people figuring out the formula for Roman concrete.  Knowledge can also be lost over time.  That's a stupid statement, but we humans often seem to think that everything gets better all the time.

Many things do, of course.  Still, I would love to be able to read the writings in the ancient library of Alexandria, though more for what they would have taught us about the people of that era.