In addition to Fortune's 40 Under 40 list, we're also keeping our eye on these 20 innovators, young guns from a wide range of industries and backgrounds.
|Stores are closing at an epic pace|
|High schooler sells $1 million in custom socks|
|Why everyone's laughing at this $400 juicer|
|Trump's new problem: Americans aren't shopping|
|New solar-powered device makes drinking water out of desert air|