World facts, geography, history.
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The Leaning Tower is the bell tower of Pisa Cathedral.
Its tilt resulted from unstable foundation soil.
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Rudolf Diesel developed the compression-ignition engine.
The diesel engine was designed for high efficiency.
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Mark Twain wrote The Adventures of Tom Sawyer.
The story is set along the Mississippi River.
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Tango developed in the Río de la Plata region.
Buenos Aires became one of its principal centers.
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The Acropolis rises above Athens, Greece.
It includes the Parthenon.
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Light travels at about 300,000 kilometers per second in vacuum.
The exact value is approximately 299,792 km/s.
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Louis Braille created a tactile reading and writing system.
It uses patterns of raised dots.
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Mary Shelley wrote Frankenstein.
The novel explores creation, responsibility, and isolation.
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Bagpipes and kilts are major symbols of Scottish culture.
They are often featured in ceremonial events.
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Stonehenge is a prehistoric stone monument in southern England.
Its exact original purpose remains debated.
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Saturn has an extensive system of icy rings.
Other giant planets also have rings, but Saturn's are most visible.
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Orville and Wilbur Wright achieved a controlled powered flight in 1903.
Their aircraft flew at Kitty Hawk.
