What's the big deal about stem cells? Well, they hold the promise of doing really cool things, like letting the blind see again:
"...The researchers took retinal stem cells from human cadavers and transplanted them into the eyes of one-day-old mice and chicks.
The transplanted cells developed into photoreceptor cells.
Lead researcher Brenda Coles said: "When their eyes fully developed, the human cells survived, migrated into the sensory part of the eye and formed the correct cells."
Of course, unless you're George & Laura Bush, who don't live in the reality-based world with the rest of us stupid empiricists.