Over the past year or two, we have been exploring what we termed the origins—or the embryology—of human development. We examined the three pillars of development: Feelings (Affects), Language, and ...

The little clump of cells looked almost like a human embryo. Created from stem cells, without eggs, sperm, or a womb, the embryo model had a yolk sac and a proto-placenta, resembling a state that real ...

Embryos, especially those of birds, reptiles and mammals, are remarkably adept at recovering from disturbances. When an embryo is cut into pieces, development can be redirected in the separated parts, ...

Life begins with a single fertilized cell that gradually transforms into a multicellular organism. This process requires ...