Our ability to see colors develops in the womb. Now scientists have replicated that process, which could help accelerate efforts to cure colorblindness and lead to new treatments for diseases.
If you heeded all the warnings, you're likely fine. But spots or blurred vision that shows up 12 hours later or the next day might be a sign the sun's direct rays permanently hurt the retina.
Six years ago, husband-and-wife scientists used gene therapy to cure colorblindness in monkeys. Now they're trying to make it work for the millions of people with faulty color vision.
Never mind the physics. Color isn't just a particular wavelength of light, it turns out. It's a fascinating mix of context and what's happening outside and inside your head.