Here's a book on caffeine. Interesting light read, if you have any interest on the subject. https://www.amazon.com/Caffeinated-Daily-Habit-Helps-Hurts/dp/159463

Here's a book on caffeine. Interesting light read, if you have any interest on the subject. https://www.amazon.com/Caffeinated-Daily-Habit-Helps-Hurts/dp/1594631387 https://www.amazon.com/Caffeinated-Daily-Habit-Helps-Hurts/d...