ACHOO syndrome, or photic sneeze reflex, is when people sneeze in response to bright light, like stepping into sunlight. It’s actually pretty common—about 10-35% of people experience it. Scientists aren’t completely sure why it happens, but it seems to be genetic, meaning if one of your parents sneezes at sunlight, you might too. While it’s harmless, it can be surprising or annoying, especially if it catches you off guard outside or while driving. VC @anabelle.jeann | Mahyar "Max" Maddahali, MD

Everyone from Aristotle to Francis Bacon has wondered, "Why do we sneeze in the sun?" Turns out, finding the answer is more complicated than you might expect ... | Great Big Story