Lived in San Francisco, CA · Author has 99 answers and 2.1M answer views · 11y ·
Cement is the most widely produced material today, but for ~1300 years we forgot the recipe.
The formula for making cement that would harden after being mixed with water was lost during the descent into the Dark Ages, only to be rediscovered during the 1700s by British engineer, John Smeaton.
Sources:
- Paul Mitiguy from Stanford's ME80
- Confirmed here: https://fp.auburn.edu/heinmic/ConcreteHistory/Pages/timeline.htm
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