On a plane the other day I sat next to a lady with a Kindle, my very first exposure. I want to buy one but thought I might ask for any current recommendations here. There were a couple of old ones for the Paperwhite but what the lady had was a Fire. Have no idea what content is available. I'm not a fiction reader but read voraciously on history and science. I'm presuming that type of reading matter is available. Intend to buy on the Amazon Prime sale day next Monday. Any ideas? Negatives?