1) The document discusses how technology has advanced significantly in the 21st century and how teens are heavily engaged with technology through computers, video games, cell phones, and the internet. 2) It also discusses how the brain functions as the central nervous system that controls the body and can be impacted by diseases like inflammation, strokes, and Alzheimer's. 3) Some potential impacts of technology on the brain mentioned are that the brain can become more efficient at finding information online, and that playing video games may improve visual acuity.