Very few theories in science explain everything.

It is the third to be found, but the first one that has shown feathers identical to the ones in modern birds. They were probably present on some of those in the past, but the feathers weren't preserved well enough to be able to see the fine structure. On this latest one, feathers are found all over the fossil, and they are best preserved on the back edge of the forearms and hind limbs.

There is no reason to CAT scan this specimen, because clearly it's not pieced together.

There are still a lot of big questions about what they would have eaten.

The feather structure is unmistakable. You see a central shaft, and then veins or barbs coming off the side. It is identical to a modern bird feather. It was even obvious to my 3-year-old daughter.

A number of them don't even have names yet.

It was collected in this quarry that literally had hundreds of skeletons in it.

Dromaeosaurs are really interesting because they are so close to birds in evolution, having feathers and other, similar attributes.