What new technologies were important in the history of bridges? Why did the Romans use elevated...

What new technologies were important in the history of bridges?

Why did the Romans use elevated aqueducts instead of pipes to convey their water?

Which of the Grand Challenges for the 21st century do you believe is most important? why? which challenge do you believe to be the least important? why? what challenges do you believe should be added to the list why?

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Ally Wells answered 1 year ago

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