For this week's Ask Science Mike, we address the following questions: How many humans are needed to populate the Earth? How can random mutation create diverse species? How could evolution create an eye? How do we know macroevolution occurs? Does evolution have a goal? You're in charge of this program. All you have to do is submit a question using #asksciencemike on Twitter, YouTube, or Soundcloud. You can also submit questions anonymously on asksciencemike.com. The easiest way to get new episodes is to subscribe on iTunes here. Ask Science Mike is made possible by listeners like you. Learn more on our Patreon page. Here are some resources on each answer if you'd like to dig deeper. How many humans are needed to populate the Earth? Minimum Viable Population Population Bottleneck Easy Human Population Size Magic Number for Space Pioneers How can random mutation create diverse species? Mutations 101 Natural Selection How could evolution create an eye? Scientific American on the Evolution of the Eye. How do we know macroevolution occurs? Evolution at different scales: micro to macro Does evolution have a goal? Evolutionary Convergence Ask Science Mike is produced by Gregg Nordin. The Ask Science Mike theme song was written, performed, and recorded by Jeb Bodiford. If you need original podcast music, he's your guy. You've got questions, he's got answers. Even though we may not understand he'll talk anyway. You've got problems, he won't solve them, But he'll talk and talk and talk until he's blue in the face. Science, faith, and life - Ask Science Mike.