What does "reddish green" look like? Not brown, not olive - an actual color that's simultaneously red and green the way cyan is simultaneously blue and green. You can't picture it. Neither can I.

TL;DR: Researchers have discovered a color called "olo," unseen by humans before, by stimulating specific M cones in the retina. This breakthrough bypasses natural RGB limitations, revealing a unique ...

Issue 10 (May 2023) of CURIOUS is out now, bringing you science highlights for the month plus deep dives into intriguing topics, interviews, exclusives, diary dates, and explanations for some of Earth ...