This course will explore the science behind sleep, from the basics of sleep physiology to the latest research on sleep disorders. We will discuss the importance of sleep for physical and mental health, and the potential consequences of not getting enough sleep. We will look at the different
From Wikipedia
A drill is a tool used for making round holes or driving fasteners. It is fitted with a drill bit for making holes, or a screwdriver bit for securing fasteners. Historically, they were powered by hand, and later mains power, but cordless battery-powered drills are proliferating due to increased efficiency and ease of use.