National Geographic Emerging Explorer and underwater archaeologist Guillermo de Anda dives into remote, flooded caves and cenotes (sinkholes) in Mexico, searching for signs of the ancient Maya.
Upcoming Events at National Geographic Live!
http://events.nationalgeographic.com/events/
Channel: Education Channel
Related tags:
![Identità goniometriche: sin(45°-α) cos(45° α)=[√2cos(2α)]/[cos(α) sin(α)]](http://video.territorioscuola.com/media/thumbs/identita-goniometriche-sin45-cos452cos2-cossinsun-08-sep-13-133530-0200.png)
