[danskil]

Wouldn't it be cheaper (stickers aren't free) and more effective to remove the poster? Nasa made a 1 million dollar pen to write in space, the Russians...

[Sukotto]

The Russians were at risk of pneumoconiosis due to breathing graphite dust and tiny little bits of eraser..

[hristov]

No. Labor is much more expensive than stickers and those posters are a bitch to remove.

[protomyth]

obligatory link to set right the NASA pen thing http://www.snopes.com/business/genius/spacepen.asp