Just a few years ago, biologist and medical personnel were surprised to learn that fetal cells can escape and enter the mother's blood. how can these cells be used in fetal testing?

I learned that you can bake anything in the sun with these instructions:

If you get a pizza box, put aluminum foil inside so the light of the sun reflects off of it and hits the food inside. So no bugs or anything gets into the food, put a sheet of plastic over it and make sure the sun is shining bright and hot so your food gets warm :) hope this helps I only got it from TV