3 ms·
Here's the report: http://www.nap.edu/openbook.php?record_id=12507 http://www.nap.edu/openbook.php?record_id=12507 (it was funded by NASA)
by eli 12y ago
Here's the report: http://www.nap.edu/openbook.php?record_id=12507 http://www.nap.edu/openbook.php?record_id=12507 (it was funded by NASA)