Sure, invisibility is about Harry Potter cloaks and invisible inks. But it’s so much more than that, too! From the way butterflies see a secret world of light that humans can’t, to the reason polar bears are completely undetectable to infrared cameras, there’s a whole big world you ought to hear about… even if you can’t see it. Featuring author Bob Berman. Learn more about your ad-choices at https://news.iheart.com/podcast-advertisers