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Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3 -- slightly greater than that of iridium and twice that of lead.

Why Nikola Tesla was the greatest geek who ever lived - The Oatmeal (click through to read the whole graphic)

Is this a mosquito? No. It’s an insect spy drone. It can be remotely controlled and is equipped with a camera and a microphone. It can land on you, and it may have the potential to take a DNA sample or leave RFID tracking nanotechnology on your skin. It can fly through an open window, or it can attach to your clothing until you take it in your home.

View from the ISS at Night by Knate Myers. Every frame in this video is a photograph taken from the International Space Station. All credit goes to the crews on board the ISS.