The Mystery on the Great Wall of China

<strong>The</strong> Great Wall 107
“<strong>The</strong>re’s an X here,” said Li. She pointed
to a nearby signal beacon where dried wolf dung
was once burned to warn of impending attacks.
“So maybe there is some treasure there?”
Grant was quiet. He kept looking at the
last X on the map. He walked over to look at a
diagram of how the wall was constructed. He
could see that it was filled with large stones,
brick, earth, rubble, and, the sign said, a mixture
of lime and rice that worked like concrete to seal
the mixture all together.
Grant thought it was rather odd that rice
and lime juice would become as hard as