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RE: When Elena met Isolde, aka the antimatter CERN tour on the back of a puma
The CPT symmetry idea is very old. It has appeared in the 1960s. However, its tests are still on-going (it passes all tests so far).
Hahahaha, new, old, is all relative. I would say 50 years ago is indeed pretty old compared to our own timeline of being on planet earth in living condition. However, in terms of science 50 year ago is pretty new to me :)
Yes, you are totally right. Knowing that particle physics is a very young field, 50 years can be considered as old, no? :D
Hahahaha, yep , all relative! :)