Last 50 years ago,
People did not have personal computer, compact disks or mobiles. They did not know about the quasars or the cloning of mammals.
Last 100 years ago,
People did not have television, air-con, antibiotic, or spiral-bound notebooks. They did not know about DNA or the Pluto which is the outermost planet in our solar system.
Last 500 years ago,
People did not have photographs, electric power, bicycles or thermomethers. They did not know about bacteria, blood circulation, or moons around other planets.
Last 1,000 years ago,
People did not have printed books, clocks, eyeglasses, or guns. They did not know about capillary action, the origin of fossils or the causes of solar and lunar eclipses.
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