科学美国人60秒:Mississippi Mound Builders Meet the 33rd Legion
2015-05-07来源:scientificamerican
Update Required
To play the media you will need to either update your browser to a recent version or update your Flash plugin.
Astronomer Alan Smale spends his days at NASA Goddard Space Flight Center exploring celestial objects, but he's also the author of Clash of Eagles, an alternate-history novel in which a Roman Legion invades North America and encounters the Cahokian civilization
手机网站