Science & Technology Q&A for Kids (and others) [September 3, 2021]

Stephen Wolfram answers general questions from his viewers about science and technology as part of an unscripted livestream series, also available on YouTube here: https://wolfr.am/youtube-sw-qa Questions include: What do you think of psychological personality tests? Which type are you? - ENTJ is the CEO personality type - Is replication a necessary criterion for the validation of a scientific experiment? - So are personalities clustered or not? ​I wonder If there are datasets available - Can you explain the science behind the iron rod that bore through Phineas Gage's head - AI, Politics & Decisions please. -  ​How crazy would it be if Politics becomes like hedging where its all run by algorithms. Vote algo 1 for prosperity! Algo 3 is tough on crime! Algo 4 is more compassionate.