This is my first time incubating eggs, and I am doing it with my kindergarten class. Today is day 10, and I candled the eggs. I can see evident veins in a few eggs, but in some all I see is a very dark mass. The dark mass looks different from a regular egg that is not developing, so I am thinking that their might be something going on in there? Maybe? It is hard to get my classroom completely dark, so maybe that is why I am having a hard time seeing all of the details. The hallway lights are always on in the school, and those lights shine into my classroom. I am a novice, so I really have no idea. Any help or advice would be greatly appreciated!! Thank you!