Is it possible that we are reborn as a new person and have completely forgotten our past live?

Possibly.

There's a video on you tube somewhere, and it's about a kid that points out to c*ps where his previous body was. He also helped catch the people who m*rdered him.

There's always the possibility, but we'll never know until we d*e

There's no plausibility, I am currently answering your question as a paper bag

the index of refraction of the second medium is higher. i just took the test trust me !