Sky-lab was 36 meters long and/or the size of a10 story building with a docked Apollo command and service module, had a mass of about 90.6 tons.

 The living Space was about the same as that of a small house. Because crews stayed for one, two, or three months, the orbital workshop was designed for habitability, with more amenities than previous spacecraft.

 Among the features especially appreciated by crews were a large window for viewing Earth, a galley and wardroom with a table for group meals, private sleeping quarters, and a shower, customized for use in space on Skylab.

 Two solar array wings were attached to the orbiting workshop for launch, one on both sides. When Skylab reached space, the arrays would extend, showing solar cells to the Sun to produce 12 kW of energy. And after many years of work and flight Skylab fell out of orbit and into the Indian Ocean never to be seen again.

Facebook has been growing quickly. It has become a community of more than 400 million people in just a few years. It’s a challenge to keep that many people satisfied over time, so we move quickly to serve that community with new ways to connect with the social Web and each other. Sometimes we move too fast — and after listening to recent concerns, we’re responding.

The challenge is how a network like ours facilitates sharing and innovation, offers control and choice, and makes this experience easy for everyone. These are issues we think about all the time. Whenever we make a change, we try to apply the lessons we’ve learned along the way. The biggest message we have heard recently is that people want easier control over their information. Simply put, many of you thought our controls were too complex. Our intention was to give you lots of granular controls; but that may not have been what many of you wanted. We just missed the mark