There's this old saying: "You can't prove a negative". It's wrong in that you often can indeed prove a negative, but the idea is still useful. Example: What wou

There's this old saying: "You can't prove a negative". It's wrong in that you often can indeed prove a negative, but the idea is still useful. Example: What would it take to conclusively proof that I never killed anybody vs. that I did? For the former, you'd basically need a continuous video feed from my birth. (b) "hardly" means something other than what you're thinking. No worries, many Russians make that mistake when speaking english.