Measles vaccinations may indirectly prevent other communicable illnesses by protecting the immune system from damage, especially in children.Psephology is the scientific analysis and evalation of elections, but in modern times it faces some problems. Is there a crisis in psephology? Also, how much have our weather predictions improved in recent times?Dr. Hannah Brown studies the relationships of embryos and their environment, and talks about the Chinese research into human embryo DNA editing.