Why some things are darker when wet
Why are some things darker when wet?
— Fermat's Library (@fermatslibrary) August 6, 2019
It's an interesting question and you just need some basic knowledge about elementary optics to understand it. Learn more here: https://t.co/dHSy9GTkDp
A great paper for your summer ☀️reading list 📚 pic.twitter.com/PTmROv4bOl