A human fetus doesn't develop retinas until around gestational week 28. Learn how researchers have tried to figure out what babies can see in the few remaining weeks before they're born in this episode of BrainStuff.
Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

What Do A.M., P.M., and SOS Stand For?
09:18

How Do Fainting Goats Work?
09:04

Does Smog Make Sunsets More Beautiful?
08:23