21. Credits: Slide 5-7 by Sarah Davies, CC Public Domain Dedication Slide 8 - circo de invierno ⑲ ~ under a CC BY License Slide 10 Photo under CC BY: Flickr user: pixle Slide 3 Declan McCullagh/CNET News used under fair use Slide 19 was remixed by Brian Rowe under fair use as part of my First Amendment rights, original artist unknown at this time.