Eclipse mania has driven up the price of the eclipse glasses needed to filter sunlight to levels where you can look safely at it. But, fear not, a simple trick of optics will let you look at the sun with nothing more than a cardboard box.
from Forbes Real Time http://www.forbes.com/sites/chadorzel/2017/08/20/how-to-look-at-the-sun-without-buying-eclipse-glasses/
via IFTTT
No comments:
Post a Comment