11 Stunning Green Roofs So Cool They May Turn Rush Limbaugh Into a Tree Hugger
Living roofs -- also called vegetative or green roofs -- are growing in popularity in the U.S. and are already popular in Europe. See some of the most stunning examples of green roofs in the world.
5 Beautiful Pictures of Osmium, the Rarest Natural Earth Element
Osmium is a hard, brittle, bluish-white transition metal in the platinum family and is the densest naturally occurring element, with a density of 22.59 g/cm. According to Dvice, it's "both the densest and the rarest element that you can dig out of the Earth. It's so hard that it's used (as an alloy)