A video making the rounds shows fertilized chicken eggs incubated outside their shells. It's fascinating, but not a first.
Some versions making the rounds claim this clip from the show Gatten shows the first time this has happened, but the method has been known for years. Here's the same process from 2013, which has more footage of the "hatching."
More info on the process at Snopes:
• Shell-Less (Snopes)