Hacker News Reader

Regrowing hair will be the last thing every solved.

Nah, too much money in that. Last will be something with little obvious outward sign, and I’d guess brain related.

Open question [ELI15]: why can’t we tissue culture scalp skin for hair, like we can skin in general for treating burns victims?

I don't think it'll be brain related. After all there's no use in have a healthy body at an old age if the patient is suffering from degenerative illnesses that affect the brain.

Indeed, but I think brains are harder to test than anything else.

I would bet on teeth. Dental services are the biggest money makers.

ETA: question.. why aren’t we able to regrow teeth and enamel? Imagine..if we can reverse cavities and no more root canals ever?

Appears maybe we can, but it's still early:

https://www.theguardian.com/science/2019/aug/30/scientists-g...

Gum regrowth could also be an enormous money maker since most adults have gum disease to some degree and it worsens with age. The cells are skin-like and delivery could even be through some sort of brushable paste.

Reply on news.ycombinator.com