Maybe they are afraid that we will learn how to download cars.

After reading some comments and the article. (from what I know) For the media, I would recommend commercial disk as dyes on disc don't last for long (or at least don't seem to last as long as pressed). Having more than one copy would be helpful probably, in case some don't work ,and trying to make sure they don't oxidize is probably you're #1 priority after disc quality. As for the computer, some have spoken about battery problems and even capacitors and maybe even data not being on the BIOS chips and the HDD not possible spinning. Battery problem - simply removing the battery and putting it in another container, but this doesn't help keep the data in the various chips. Capacitor's are probably the tricky part as they do contain a "voltage" and you can't discharge them really so...no idea. HDD - you could try SSD but I don't think they can keep data there that long? and what's the "half-life" on data on a traditional drive? assuming it's shielded from electromagnet interferences, will it stay there "forever" ? If I was going to put such a feet, I wouldn't go with a "completed" system, as it's probably too risky. Maybe you would want to provide multiply system's and prepare each part of the system, to be stored separately from each other. And provide instructions on how to put it back together (in case some parts don't work). If you put enough parts in it, you should be able to get a complete system out of it. Personal opinion, you should just throw some CRT's in the capsule, and maybe even an LCD and Plasma, the CRT should last long enough (assuming it doesn't suffer from the same problems as a computer would) and would probably be more "amazing" to people in the future. Of course I'm assuming the CRT will be 100% dead by then, and won't be like VHS (or even LD's) where they just won't completely die.

carbon dioxide is a natural element in the atmosphere and is made wherever humans are so, plus you simply plant a bunch of plants to off-set humans living there