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The llama is most useful as a pack animal. Llamas generally can carry about 130 pounds (60 kilograms) each, and are sure-footed on the mountain trails. They can travel from 15 to 20 miles (24 to 32 kilometers) a day with a full load. If a llama feels its pack is too heavy, or if it thinks it has worked hard enough, it will lie down and refuse to move.
The ancient Maya once occupied a vast geographic area in Central and South America. Their civilization extended to parts of what is now Mexico, Honduras, and El Salvador, and most of Guatemala and Belize.
Llamas cannot carry men, heavy materials or for that matter tow stones, a recent experiment established that even kites could be applied with a similar effort in mind.
news.nationalgeographic.com...
Beyond that Byrd not only would I site that it is a practical explanation for many issues in respect to Mayan, Toltec and Aztec Civilizations, I would also
site that to the best of my knowledge this is correct.
I do rememeber a conversation at ATS which cited the moving of a stone by American Indian cultures which far exceeded anything accomplished in the Easter Hemishpere.
Any thoughts?
Hot air balloons are based on a very basic scientific principle: warmer air rises in cooler air. Essentially, hot air is lighter than cool air, because it has less mass per unit of volume. A cubic foot of air weighs roughly 28 grams (about an ounce). If you heat that air by 100 degrees F, it weighs about 7 grams less. Therefore, each cubic foot of air contained in a hot air balloon can lift about 7 grams. That's not much, and this is why hot air balloons are so huge -- to lift 1,000 pounds, you need about 65,000 cubic feet of hot air!
To keep the balloon rising, you need a way to reheat the air. Hot air balloons do this with a burner positioned under an open balloon envelope. As the air in the balloon cools, the pilot can reheat it by firing the
burner.
See link...
travel.howstuffworks.com...