my suspicion would be that the hydrogen is expected to escape, and that the cryostat was to prevent damage to the instruments due to sudden major temperature changes. I could be completely wrong, though.

SuperGenPass is a good option for online passwords. especially since the website lets you customize the bookmarklet before you download it. though why there is an option to hardcode your master password into the bookmarklet, thereby completely defeating the security of it, is beyond me. conversely, the option to have it store a hash of your master password and compare it against the master pass you type in the field is nice... especially if you're like me and prone to typographical errors.