In this week's questions show, I explain how scientists know that meteorites came from Mars, is it dangerous to look for alien civilizations, what citizen science projects to get involved in, and more. Featuring Professor Nick Cowan from McGill University. 00:20 How do we know a meteorite came from Mars02:27 Why look for aliens? 08:03 What projects can software engineers get involved in? Professor Nick Cowanhttps://msi.mcgill.ca/~cowan/Want to be part of the questions show?