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Home Space shuttle Atlantis nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. (NASA/Tony Gray/Tom Farrar) Space shuttle Atlantis nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. (NASA/Tony Gray/Tom Farrar)

Space shuttle Atlantis nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. (NASA/Tony Gray/Tom Farrar)

Space shuttle Atlantis nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. (NASA/Tony Gray/Tom Farrar)

Space shuttle Atlantis nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. (NASA/Tony Gray/Tom Farrar)

The neutral body posture shown here was created from measurements of 12 people onboard Skylab. (NASA)
Nanoparticles of a car engine lubricant seen under an electron microscope. The particles’ sticky side builds up layers until there isn’t any more friction. (TriboTEX)
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