by Ellen R. Braaf
Thousands of years after the Egyptians piled up millions of huge stones to build their pyramids, scientists still ask: ”How'd they do that?” A group of researchers, including a team from the California Institute of Technology, has a surprising answer—by using kites and the desert wind to help lift the stones! To test their theory, the researchers designed a simple rope-and-pulley system and mounted it on a support frame. They attached one end to a large kite and the other to the tip of a 3.4-ton obelisk shaped like the Washington Monument. Critics called them pyramidiots, but it took the researchers only 25 seconds to raise the huge stone in a 15–20 mph wind, such as is common in the Egyptian desert. Archaeologists point out that there is no evidence that the Egyptians used kites in building. But this summer the pyramidiots plan to lift a 10-ton obelisk using only materials that were available to the ancient Egyptians. Will they unlock the mystery of the pyramids? Stay tuned!
- Why do you think scientists are interested in re-creating the machines that people used a long time ago? Write a sentence or two for your answer.
[anno: Answers will vary but could include that when scientists re-create old machines, they gain a better understanding of how people used to do things, such as build the pyramids.]
- Where can you find a rope-and-pulley system today?
[anno: Answers may vary but could include an elevator or another system used to raise heavy objects, such as at a construction site.]
- Imagine you could put a rope-and-pulley system in your home or your school. What would you use it to do? What would power the system?
[anno: Answers will vary.]