There's no question that science has gone a long way toward solving some of nature's deepest mysteries -- everything from finding what black holes are made of to why zebras have stripes.
But there are still many scientific mysteries yet to be solved. And you'll learn about 10 of them in a new video (above) from the YouTube series Alltime10s.
The mysteries make for fascinating viewing. As YouTube user John Willis commented on the video, "Wow."