Can UV light wands actually disinfect your Airbnb? An expert explains.

Airbnb needs people to feel safe. Since the coronavirus pandemic started, the company added new cleaning guidelines and a 72-hour buffer between stays. 

Still, with more than 4.9 million coronavirus cases recorded around the world, people are understandably paranoid about staying in a stranger's home. 

That's probably why you've seen ads for UV light products online, like wands that promise to kill viruses and bacteria. But just how effective are they?

The basics: UVA and UVB vs. UVC

There are several kinds of UV light, explained Andrea Armani, a professor of chemical engineering and material science at the University of Southern California.  Read more...