This YouTube video (screenshots attached) claims to show Japanese schoolchildren breaking an egg into a kind of clingfilm "hammock in a cup", and then growing and hatching a chick from it in an incubator.
Is this really real?
My first immediate thought is, "If this can happen, why don't the eggs in my cupboard at home sometimes hatch? Why do I never see an embryo in my frying pan?"
Obviously the egg has to be fertilised, but depending upon where you get your eggs (like an "organic home farm" or something) this might happen.
If it's more a matter of temperature, how warm do the eggs have to be? For how long? (ie, Could a warm kitchen cupboard in a hot summer do it?)
What other biological requirements are there to make this work?