There Are Lots of Chemistry Videos on YouTube

And only some of them are instruction on making things that go boom! I ran into this video that is full chemistry nerddom. "The densest element on Earth has almost no uses." Osmium of course. I knew it was used at one time for ballpoint pen balls, although apparently no longer. It was however used for fountain pen nibs. I am old enough to have used a fountain pen. Of course, I am old enough to have learned on a manual typewriter