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Questions | Answers | Discussions | Knowledge sharing | Communities & more.
What is the hardest natural substance on Earth?
Diamond is the Hardest Natural Substance on Earth
Diamond is the Hardest Natural Substance on Earth
See lessWho invented the first modern tractor?
In 1901, the first commercial lightweight petrol tractor was invented by Dan Albone.
In 1901, the first commercial lightweight petrol tractor was invented by Dan Albone.
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