If you or someone you know needs a new hip or knee this is an interesting, informative article. The development of the components makes one appreciate what they ended up with. We have to thank the space program for some of the materials we now consider common, everyday products.
https://getpocket.com/explore/item/...ight-get-more-common?utm_source=pocket-newtab
https://getpocket.com/explore/item/...ight-get-more-common?utm_source=pocket-newtab