Finding complete fossils of dinosaurs and amphibians is a difficult task, with museums and universities spending millions of dollars to reconstruct and acquire these ancient specimens.
Opal-mining is one of the world's most harrowing pursuits, but potentially one of the most rewarding as well. To find opals, a modern treasure hunter must dig random holes in areas of known deposits, and then lowering him- or herself down a 20 meter shaft. Besides the obvious problem of claustrophobia, and the danger…
A special kind of lab-created opal can be used to carry several encrypted messages at the same time. Find out how it can keep secrets for someone — and tattle on that same person — depending on what you spray it with.