Subtitles section Play video Print subtitles Hey There! Welcome to "Life Noggin!" Organ transplantation, where a damaged or failed organ is replaced with a working one, is one of the greatest advances of modern medicine that saves countless lives. In 2021 alone, over 40,000 organ transplantations were performed in the United States. Currently, there are six life-saving organs that doctors are able to transplant:The lungs, heart, liver, kidneys, pancreas, and intestines. Many other components of the body can be transplanted as well, including the uterus, arms, hands, and legs. And a number of different tissues like skin, different parts of the eye, and components of the musculoskeletal system. Imagine getting all of these replaced. You would be like half you and half… all the other people! Oh boy! That's giving me the heebie-jeebies! "Are you still you?" I'll save that question for the end. But there are some organs that can't be transplanted, like the entire eye. While small parts, like the cornea or sclera, can be transplanted. A whole-eye transplant has never been done successfully. This is because of the complexity of the optic nerve, which consists of over a million tiny nerve fibers that would need to first stay alive after removal from the donor, then be reconnected to the recipient, and finally, be able to rejuvenate and regrow from the eye to the brain. So far, scientists are unable to fully accomplish all of these steps, though they are hard at work at trying to find a way to do so, like by blocking genes to prevent the death of nerve cells and finding drugs that make them regrow. The brain has similar challenges. Scientists have yet to find a way to keep it alive after removal, and establish a connection of the spinal cord to the recipient's. Though, notably, one pair of surgeons have claimed that a whole-body transplantation, in which the recipient's head is attached to a donor's body is possible. And while their controversial plans to perform this operation on living humans fell through in 2019, They claim to have already transplanted the heads of mice and reconnected the spinal cords of a dog and a monkey. However, their studies and claims have been highly criticized for lacking evidence. But what if it did work and you could replace your entire body one day? Are you still you if most of your body is someone else? At what point do you stop being you? There's a thought experiment called "The ship of Theseus" that asks a similar question about one's changing identity. If, over time, you replace every part of the ship, is it the same ship that existed before? While you're having that existential crisis, let me know in the comment section below. “What should I talk about next?" Ask me any weird question like this one in the comments, and make sure you use the hashtag #DearBlocko so I can find it! This video is sponsored by our good friends over at "NordVPN!" I live inside the computer and sometimes invaders try to burst through the door and steal my pizza bagels. Mr. Nord here helps protect my house from those invaders! NordVPN has threat protection that blocks intrusive ads and web trackers when a user like me downloads a file. Threat protection inspects it for malware. It also automatically scans URLs and blocks malicious ones. But aside from virtually karate chopping malware for me, NordVPN offers 5500+ servers in 60 countries. Find a server near you for better speed or in a faraway location for more content. Simply change your virtual location. You'll get access to shows that might not be available in your country! It takes just a click. Open the map, click on the location, and you'll be connected in seconds. It's that easy! Oh and Mr. Nord here is fast. He's very proud of it actually! It's confirmed by the speed tests. NordVPN is the fastest VPN out there! NordVPN has been protecting the "Life Noggin" world for a while. And if you want to protect your computer and support "Life Noggin," consider downloading NordVPN now by going to NORDVPN.COM/BLOCKO. Or click the first link in the description! It's risk-free with Nord's 30-day money-back guarantee! Click here if you wanna find out how we can live to 200 years, or click here to watch this video! Thanks for clicking Like! And subscribe! And as always, my name is Blocko. This has been "Life Noggin." Don't forget to keep on thinking!