Here is your info. And for another 10 points I will do your presentation for you too. lol
Check out epinions.com for some info on scanners...
Most scanners are flatbeds, in that you lay the original face-down on the glass and scan it like in a photocopy machine. Some are available with sheet-feeders, useful for scanning stacks of originals (again, like the sheet feeders on copy machines). ...