Histologically, GCTs are classified as germinomas, embryonic carcinomas, yolk sack
tumors, malignant mixed GCTs and malignant teratomas.
Between the two of them, we'll have total solar energy in our lifetime, and we will fulfill what Buckminster Fuller [a futurist who wrote Operating Manual for Spaceship Earth] said: that we'll eventually have to come out of the egg and quit living on our yolk sack
and start living off of what created all our fossil fuels--the sun.
They'll be fine in the incubator for a day or so--the residual yolk sack
will sustain them, no problem.