UPSIDE-DOWN Rivers On Mars?!

The "Mountain or Valley?" illusion makes our brains turn valleys inside out. But inside-out valleys are a real thing, both on Earth and on Mars.  Script Writers: David Goldenberg & Emily Elert  Video Illustrator: Ever Salazar Video Narrator: Emily Elert  With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Emily Elert, Peter Reich Music by: Nathaniel Schroeder