You've got the links and the extra video. *shrug* Byee river...have a good day Please Register or Log in to view the hidden image!
Almost all of them. Different reactions are slowed to different degrees. Google the Q10 coefficient - that's how much biological and chemical activity is slowed by every 10c reduction in temperature. The higher the number, the more the reaction is slowed by lower temperatures. Which means that some of the reactions within Pfizer's vaccine preparation have very low Q10 numbers, so you have to get them very cold to slow them enough so that the preparation isn't degraded before it is administered.