1. Dinosaurs had feathers.
Brian Switek writes in My Beloved Brontosaurus (Farrar, Straus and Giroux, 2013):
The first fluffy dinosaur discovery enthralled paleontologists. At the annual Society of Vertebrate Paleontology conference in 1996, scientists circulated a photograph of a small fossil that revealed a mane of fuzz along a dinosaur's back and tail.
It was a small theropod called Sinosauropteryx and had a coat of protofeathers that weren't enough for flight, only for show and keeping the dinosaur warm. This and further discoveries confirmed what's possibly the greatest fact you will ever know: birds are dinosaurs.
2. In fact, most dinosaurs probably had some kind of feathers.
Paleontologist Steve Brusatte, who wasn't involved in the research, agreed:
This does mean that we can now be very confident that feathers weren't just an invention of birds and their closest relatives, but evolved much deeper in dinosaur history. I think that the common ancestor of dinosaurs probably had feathers, and that all dinosaurs had some type of feather, just like all mammals have some type of hair.
3. Dinosaurs' feathers evolved before their ability to fly.
4. Raptors might not have hunted in packs.
5. Brontosaurs might have existed after all.
6. Male and female stegosaurus might have looked different from each other.
7. But there is one sure fire way to identify a female dinosaur: look for a special kind of bone.
Birds form a kind of bone tissue called medullary bone before laying their eggs. They draw calcium from this tissue and use it to form eggshell. And in 2005 paleontologist Mary Schweitzer revealed that a Tyrannosaurus rex had formed this bone tissue to lay their eggs too. A few years later, other paleontologists reported finding the tissue in two other dinosaurs too (Allosaurus and Tenontosaurus, for those who are keeping track).