the.com/iridium
the metal that dropped from the sky and snitched on the dinosaurs' killer
asteroid clueEarth's clay spike revealed the dino-killing impact
second densestonly osmium edges it out in heft
won't budgeresists corrosion better than almost anything known
melts atroughly 2,446 degrees Celsius before flowing
space-richfar more common in meteorites than crust