Given how frequently we cover stories about science, it’s probably not surprising that a lot of us here at Curiosity feel a real affinity toward people who made scientific discovery their career. Can you imagine what it must feel like to answer a giant question about the universe with absolute certainty? Well, it turns out there’s a lot less certainty than we sometimes assume. Here are a few of our favorite scientific ambiguities, flip-flops, and raging debates.

— Read on curiosity.com/topics/5-issues-science-hasnt-settled-yet-curiosity