Home buyers have more purchasing power when mortgage rates drop.
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Not far from their minds is the reality that China is also attempting to land its own crew on the moon before 2030 and may be able to get there before the United States. NASA hasn't sent humans to the lunar surface since Apollo 17 in 1972. And though no other nation has followed in the giant leap for humankind, that won't always be true.
"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.