If you want to see how animal embryos grow in eggs, you typically have to poke a hole in the egg and patch it up later. That's not always safe, and it may give you an incomplete picture of what's going on. Scientists at Beijing's Tsinghua University think they have a better solution, though. They've developed transparent artificial bird eggs that mimic the real deal while showing every single nuance of the embryo's development. The key is a special process that gives an organic polymer the same shape as an egg, offering the avian a relatively natural environment that's easier to work with in a lab.