Bridges connect people by joining together different parts of a city, land masses or continents; over the years, humanity's bridges have become more advanced.
A look through the history of aviation reveals how Sir Frank Whittle invented the jet engine, which was initially used by military jet fighters.
A look at various dams sheds light on controlled irrigation, sunken cities and hydropower as humanity has looked to nature for inspiration.
The innovation of the modern sewage system serves the important sanitary purpose in society of transporting bodily waste to the treatment plant and beyond.
Thousands of satellites in orbit around the planet are used mainly for telephony, television, radio and digital data transmission, as well as for research.
A German physics professor invents the X-ray and takes an image of his wife's hand, and in years to come, the invention is used in medicine and other fields.
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