Beneath 8,200 feet of water, the Alvin submarine scopes out the Pacific's seafloor in the 1970s. The geologists aboard weren't searching for life — they were on the hunt for hot spots and undersea thermal vents. Courtesy of Kathy Crane hide caption

itoggle caption Courtesy of Kathy Crane

When the T. rex skeleton was first put on display, it was presented standing vertically, in this Godzilla-like pose, as seen at the Carnegie Museum of Natural History around 1950. Recent studies show the dinosaur actually kept its body horizontal. Watch the videos here to see how T. rex walked. Carnegie Museum of Natural History hide caption

itoggle caption Carnegie Museum of Natural History