A mathematican, biologist and engineer were so stoned that they struggled with the claim "All odd numbers are prime." The mathematician reasoned "3 is prime. 5

A mathematican, biologist and engineer were so stoned that they struggled with the claim "All odd numbers are prime." The mathematician reasoned "3 is prime. 5 is prime. 7 is prime. 9 is ... not prime. The claim is false." The biologist reasoned "3 is prime. 5 is prime. 7 is prime. 9 is ... not prime. 11 is prime. 13 is prime. The claim looks true, within reasonable experimental error." The engineer reasoned "3 is prime. 5 is prime. 7 is prime. 9 is prime. 11 is prime. ..."