I've talked about this before with my students.
Wireless keyboards and mice are a HUUUGE security risk.
Now...a couple of fellow nerds have agreed with me.
http://www.cnet.com/videos/watch-our-computer-get-mousejacked/
http://www.hackbusters.com/news/stories/540615-mousejack-attack-hijack-wireless-mouse-keyboard-dongles-from-100-meters-to-control-pcs
http://securityaffairs.co/wordpress/44765/hacking/mousejack-attack.html
