Human embryos created without egg or sperm in controversial breakthrough

Oh, brave new world, that has such embryos in it.

In a dramatic scientific first, researchers have created synthetic human embryos without using sperm or an egg.

No one knows if these embryonic structures — created from stem cells — could develop into a viable living organism, or what that organism might be like.

But the breakthrough is sure to ignite furious ethical, legal and scientific debate.

The synthetic embryo models had primordial cells that could eventually develop into egg and sperm cells.