There are a number of resources that are essential to modern society, without that fact being broadly known. My favorite is the blood of horseshoe crabs, which is currently irreplaceable as a detection mechanism for the presence of toxins on any medical equipment or medicines that will be entering the human body through the skin. If horseshoe crabs go extinct, modern medicine will take a big hit. Another such resource is helium. I didn’t know how useful it was until college, and my hunch is that a lot of folks remain ignorant about it throughout their lives.
While it has a large number of uses, arguably the most important use of helium is in its liquid form as a super-coolant, keeping the superconductors of MRIs and NMRs at the temperatures required for the work they do. While I put effort into doing as little lab work as possible during my college years (while doing what was necessary for my biology degree), the importance of the NMR in analyzing substances was clear, and it’s hard for me to imagine how much damage the loss of that technology would do. It wouldn’t cause the downfall of civilization, but it would remove a powerful tool in our efforts to diagnose illness, and to understand the universe we inhabit.

MRI diagram

