Which near-Earth asteroids are ripe for a visit?

In April 2010, amid mounting criticism that his space plan lacked direction, President Barack Obama gave a speech in Florida to lay out a few ambitious goals he had in mind for NASA. The details of how those targets would be met remain somewhat sketchy even today, but the goals themselves were clear–sometime around 2025, the U.S. would perform an unprecedented feat.

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Which near-Earth asteroids are ripe for a visit?