Soldering in Space

Ever wonder what would happen if you tried to solder something in space? Something interesting happens. Solder is usually composed of lead, tin and rosin -- rosin is made from tree gum, and is used in solder to keep it flowing like a liquid and to remove oxidation from the melted solder and metal it's in contact with. In space, when solder is heated, a bubble forms, just like on Earth. But unlike on Earth, the rosin droplet that's usually burning off, forms in a small bubble and starts spinning around. No one knows why yet. Read more at NASA's science site, and watch a video of the spinning rosin in space.