To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it
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These cases are perfectly simple and easy to distinguish. In a free hour, when our power of choice is untrammelled
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Spacewalkers Shane Kimbrough of NASA (left) and Thomas Pesquet of the European Space Agency worked to install new roll out solar arrays on the space station.
A cataclysmic cosmic collision takes center stage in this image taken with the NASA/ESA Hubble Space Telescope.
