71: People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water.
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72: Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.
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73: Starting around 7000 B. C., and for the next four thousand years, much of the Northern Hemisphere experienced temperatures warmer than at present.
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74: When Henry Ford first sought financial backing for making cars, the very notion of farmers and clerks owning automobiles was considered ridiculous.
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