The-Wright
The-Wright t1_j2bc2zi wrote
Reply to ELI5: Why is the recoil of a gun not nearly as bad as getting hit with a bullet while wearing a bullet proof vest if they are both the same force? by Tratakaro
For some reason, no one else has mentioned that a person firing a gun knows that the recoil will occur when they pull the trigger and will brace themselves against that force, while taking a round into a bulletproof vest is usually a surprising event that the subject hasn't really prepared for.
It's akin to a person in a physical confrontation might easily brace against an obvious shove from someone in front of them, while an identical shove coming suddenly behind would knock them over.
The-Wright t1_ja0fo57 wrote
Reply to comment by EggyRepublic in ELI5. What happens to ‘criminals’ when the law changes and what they were imprisoned for is no longer illegal? by L0rdTeddingt0n
Retroactively charging someone for an action that was legal when they performed it is called an ex post facto charge, and the US Constitution explicitly prohibits both federal and state authorities from pursuing them