Do you know what this is? (slide 2) An O ring. A common item used to help seal parts in machines. Usually made of rubber, they are used when joining parts in machines to seal any gaps so that liquids or gases from one part won’t escape. Every have a leaky faucet? Sometimes, it’s an O ring that you can’t even see, it’s deep inside, have to take apart, can be very small, but can make a huge difference. It was an O ring like this that was discovered...