It’s 11:15 am. For the next 15 minutes you will recite in full a Latin prayer you learned once, years ago, catch a whiff of a scent that reminds you of a yellow wood house, deploy three different passwords, and send editors emails in a third language. Your brain is a complex but highly efficient master, and scientists are never through exploring how the brain works. Here are some fascinating views of the mind at work--and what happens when it does not.