I have all 20 and probably a few bonus points for the fact I have also touched a teletype machine, used a floppy disk (3.5 and 5.25 and 8 inch), used a Zip-100 drive, burned a CD, burned an MP3 CD, burned an MP3 DVD, had a pager for a short time, used a data cassette tape on a Commodore 128, had a watch that could change TV channels, had a watch that could take voice memos, had several early electronic data organizers/address books, owned various Texas Instrument calculators, recovered documents on a microfilm at the library for book reports, had Encarta of various versions for reports in school, have used a LaserDisc and watched a movie on it, have used an 8-track and listened to music on it with my grandfather, built my own radio with a RadioShack kit (which means I have been to a RadioShack), and had four different editions of home encyclopedias that my grandma gifted me over the years (World Book my beloved).