Which Australian ISPs throttle BitTorrent & by how much?

http://www.gizmodo.com.au/2011/10/which-australian-isps-throttle-bittorrent-and-by-how-much/#more-487510

Erasable gel ink pen (video)

After erasure, the ink can be made to re-appear by exposure to very low temperatures (approximately -14°F, -25°C).  Invisible ink?

Inexpensive too.

http://the-gadgeteer.com/2011/10/21/pilot-frixion-ball-eraseable-gel-ink-pen-review/#more-78459