Crew members of Expedition 64 aboard the International Space Station tackled a list of to-do items that took them outside the airlock Saturday. During maintenance on an external cooling system, the astronauts had to take extra safety precautions after possibly getting toxic ammonia on their suits. Victor Glover and Mike Hopkins had no trouble removing and venting a couple of old jumper cables to remove any ammonia still lingering in the lines. But so much ammonia spewed out of the first hose that Mission Control worried some of the frozen white flakes might have gotten on their suits. Hopkins was surprised at the amount of ammonia unleashed into the vacuum of space. "Oh yeah, look at that go. Did you see that?" he asked flight controllers. "There's more than I thought."