2 - Hindsight bias is also called 'knew it all along' -- the idea being that sometimes people say that they were certain of something before they knew the outcome. But evidence shows us that their votes are changed and their certainty is substantially increased by knowing the result. It's explained by a combination of factors -- a need to be right, a confusion of the past with the present, or simply an inability to actually put information aside when making recollections about the past.
3 - Lie detection is typically not very accurate. I think it is probably more difficult when you do not know the subject well, or do not have any way to verify conflicting information. Most of the behaviors that indicate lying tend to be undetected by the human eye. Most of the so-called indicators of lying tend to be characteristics of multiple situations, including stress. There are a few heuristics that might be used, but these can be defeated. Generally people cannot detect lying.
4 - We know that jurors are influenced by eyewitness testimony, especially when the witness is confident, because we have verified through experiments that this factor swings votes substantially.
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