A 120 million-year-old bird fossil from China has some rather unusual dinosaur-like features in its otherwise standard avian skeleton, including a weirdly T. rex-like skull.
In the context of a disease, the transition from "epidemic" to "endemic" means a pathogen is no longer causing outbreaks but isn't disappearing.
The 9,000-year-old Jericho Skull now has a new face, thanks to the latest reconstruction techniques.
They're a popular way to track daily activity, but how do step counters work?