It's Okay To Be Smart (a YouTube channel dedicated to all things science) has a concise video about evolution explaining that there was no first human. It's very well-made with great graphics that are easy to understand and a presentation that's also easy to follow. It's a video worth sharing to people who are not that familiar about the theory of evolution. Watch Joe Hanson (host and writer of the show) explain how there was no first human below. I am yet to read The Magic of Reality (a book by Richard Dawkins) but Hanson mentioned that this particular video was inspired by said book.
The cover for Dawkins' book: