Bottom line: If you have big dreams, you need a healthy brain. Dr. Gabrielle Lyon tells us how to improve brain function, when the brain cleans itself, and how cardiovascular training prevents atrophy. | Codie Sanchez

168K views · 3.3K reactions | What does it mean to have—or not have—free will? Were the actions of mass murderers pre-determined billions of years ago? Do brain processes trump personal responsibility? Can experiments prove that free will is an illusion? @Bill Nye The Science Guy, Steven Pinker, Daniel Dennett, Dr. Michio Kaku, Robert Sapolsky, and others approach the topic from their unique fields and illustrate how complex and layered the #freewill debate is. | Big Think | Facebook