If we look at jet aircraft, wear depends on the airframe and the engines, and the airframe seems to be the number of pressurize/depressurize cycles as well as the running hours. Engines get swapped out routinely but when the airframe has enough stress it's time to retire the aircraft lest it suffer catastrophic failure. Rockets are different in scale (much greater stresses) but we can expect the failure points due to age to be those two, with the addition of one main rocket-specific failure point: cryogenic tanks.
How long each will be reliable can be established using ground-based environmental testing. Nobody has the numbers for Falcon 9R yet.
Weight vs. reusable life will become a design decision in rocket design.
Like others I found the headline confusing. I read it as "Researchers are predicting the use of Wikipedia as a vector for the spread of disease". This may mean that:
- Disinformation and ignorance are diseases.
- Memes and computer viruses are diseases.
- Wilipedia contains information that leads to depression.
- Instructions on Wikipedia lead to substance abuse.
- This is getting entertaining, fill in your own reason here.
One of the definitions I found was:
One who makes great sacrifices or suffers much in order to further a belief, cause, or principle.
I am sure that fits. While SpaceShip II is mainly intended for a non-exploration purpose, the program has resulted in some significant advances in rocketry and White Knight II has significant non-tourism use. These pilots have been involved in other space efforts, I remember the one who was injured from the Rotary Rocket test flights. There are lots of safer ways for these folks to make as much money as a test pilot is paid. They do what they do to advance our progress in aeronautics and space.
Martyrs? Who killed them for their beliefs?
Go away, troll. They certainly died while pursuing something intensely important that they were willing to risk their lives for. The fact that you weren't around to pull the trigger makes them no less martyrs.
Anyway, I have better uses of my time than to waste another minute with you.
We knew what was going on when you ran your anti-IBM campaign, sometimes even positioning yourself as arguing on behalf of our community. It was a way to lend credence to IBM and MS arguments during the SCO issue. To state otherwise is deceptive, perhaps even self-deceptive.
Florian, you would not be devoting all of this text to explaining yourself if you didn't feel the need to paint your actions in a positive light. That comes from guilt, whether you admit it to yourself or not.
Go write your app, and if you actually get to make any money with it you can give thanks, because it will happen despite what you worked for previously. Keep a low profile otherwise because your credibility is well and truly blown and you can only make things worse. And maybe someday you can really move past this part of your life. But I am not holding out much hope.