The day set fair without a breath of wind.
Addition on the real numbers is commutative because for any real numbers s,t, it is true that s+t=t+s.
Those brought into use again were several forms of lutes, violins, and bagpipes, which were played upon proficiently by the jongleurs, some of whom played also upon psalteries, organistrums, guitars, and tambours with great skill.
jongleurs,
Beyond Earth, the Moon is the only body in space that has been systematically sampled. … These samples were collected by the six U.S. Apollo and three U.S.S.R. Luna missions from known locations on the lunar surface. … Each Apollo landing increased in exploration complexity and returned even greater amounts of lunar samples.
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