<p dir="ltr">It took them this long because there are that few astronauts. It's hard to get even a single data point, let alone the volumes of data we're used to with ground-based studies.</p>
<div class="gmail_quote">On Apr 11, 2014 7:46 AM, "David Lubkin" <<a href="mailto:lubkin@unreasonable.com">lubkin@unreasonable.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<<a href="http://science.nasa.gov/science-news/science-at-nasa/2014/10apr_twins/" target="_blank">http://science.nasa.gov/<u></u>science-news/science-at-nasa/<u></u>2014/10apr_twins/</a>><br>
NASA to Conduct Unprecedented Twin Experiment<br>
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This is an obvious (and good) idea. So why did it take them so long? Both were selected as astronaut candidates *18* years ago. And I'd think they'd get clearer data before Mark had had four spaceflights of his own.<br>
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-- David.<br>
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