all of the above, esp youtube. And the flash cards- I take them to work with me in my pockets and review even one or two body parts while riding the elevator! I quiz myself while transporting a patient. I picture the body parts and functions while feeding, bathing, etc all the residents; driving I listen to the recorded key words and lectures. IOW, I got a 98% on the endocrine system because I made flash cards and quizzed the gland, hormone, target, action, stimulus over and over and over and over... did I say I made the flash cards and then FLASHED them over and over?