It’s debate prep time for President Joe Biden and former President Donald Trump [Video]

It could be a well-rehearsed zinger or an offhand, too-loud sigh.Notable moments from past presidential debates demonstrate how the candidates’ words and body language can make them look especially relatable or hopelessly out-of-touch. They also can showcase candidates at the top of their policy game or suggest they’re out to sea. Video above: Kennedy and Nixon square off in the first televised presidential debate in 1960 Will the past be prologue when President Joe Biden and former President Donald Trump debate in Atlanta on Thursday?”Debates, being live television events, without a script, without any way of knowing how they are going to evolve — anything can happen,” said Alan Schroeder, author of “Presidential Debates: 50 years of High-Risk TV.”Here’s a look at some standout high moments, low moments and curveballs from presidential debates past. When everyone knows a sensitive question is coming yet you make the answer sound spontaneous, you’re …