I used to have a job where I drove a box truck. It was slow empty and painfully slow full. It was also speed limited to 75mph. So I would tend to hang out with the semis on the hwy. One time I was driving down the hwy and this guy in a pretty new Volvo( so the fast ones) was coming down the on ramp. I could see he was going to merge right in front of me so I slowed down to give him some space. I figured he would want to be in front of the slow box truck. As he got close to the merge he slowed down so he was even with me. I gave him a little more space to merge in front of me and slowed down again. He had plenty of room left in the on merge lane if just used the skinny pedal. Instead he waited until was almost out of room then started honking at me. I did my best to speed up my painfully slow box truck but I am sure he has to slow down to the point he was merging at 45mph as everyone was doing 75-80mph. I am sure he was cursing me too because he wasn't willing to get up to hwy speed before merging.
Promethium #61 it is so rare that it really has no practical uses outside the lab. There is most likely less than a kilogram of the stuff in the entire planet.
For anyone who is wondering the alloy metal that is radioactive is Technetium #43. It is weird it has no stable isotopes, and is only one of two radioactive elements that proceed non radioactive elements. As far as I am concerned it exists only to be different.