Space Shuttle Discovery inspires

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David Gergen and Michael Zuckerman say the shuttle's retirement should rekindle our search for leaders who can unite us in tackling big challenges aheadhttp://feeds.feedburner.com/~ff/rss/cnn_us?d=yIl2AUoC8zA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=AHqHvAXG_uY:ZU8hL0wovTk:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/rss/cnn_us?d=7Q72WNTAKBA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=AHqHvAXG_uY:ZU8hL0wovTk:7Q72WNTAKBA) http://feeds.feedburner.com/~ff/rss/cnn_us?i=AHqHvAXG_uY:ZU8hL0wovTk:V_sGLiPBpWU</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=AHqHvAXG_uY:ZU8hL0wovTk:V_sGLiPBpWU) http://feeds.feedburner.com/~ff/rss/cnn_us?d=qj6IDK7rITs</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=AHqHvAXG_uY:ZU8hL0wovTk:qj6IDK7rITs) http://feeds.feedburner.com/~ff/rss/cnn_us?i=AHqHvAXG_uY:ZU8hL0wovTk:gIN9vFwOqvQ</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=AHqHvAXG_uY:ZU8hL0wovTk:gIN9vFwOqvQ)
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