“It's Okay to be Smart” by PSB is a show that is all about science, the amazing universe we live in, and the pleasure of finding things out.

What’s the largest river on Earth? If you said “the Amazon”… you’re only half right. Scientists have discovered an even bigger river in South America, and it’s in the sky above the Amazon rainforest. Turns out, this sky river is the reason there’s a rainforest at all.