In the muck of the deep Mediterranean seafloor, scientists have found the first multicellular animals capable of surviving in an entirely oxygen-free environment. Some types of bacteria and other single-celled organisms can live without oxygen, but nothing as complex had been found as these three species of Loricifera, a group of marine-sediment dwellers who inhabit one of Earth’s most extreme and... 

Tyrannosaurus Rex (extinct 65 million years ago) Tyrannosaurus rex was one of the largest land carnivores of all time, measuring up to 43.3 feet long, and 16.6 ft tall, with an estimated mass that goes up to 7 tons. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs... 

Rather than relying on warm, fuzzy feelings to protect animals, conservationists suggest appealing to something more reliable: greed. By selling financial contracts pegged to species health, the government could create a market in the future of threatened animals, making their preservation literally valuable to investors. “The incentive to conserve would increase as the likelihood of species...