In 2011, a couple bought a box of textbooks for $10. Inside, they found a 25-cent bill signed by the president of the Republic of Texas, Sam Houston, and subsequently sold it for $63,250.
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Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
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Recently, archaeologists excavating in the old medieval town of Odense in Denmark uncovered 700-year-old barrels of poop - and, to their surprise, they still smelt.
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It has been calculated that every 2 minutes, we take more pictures than all of humanity in the 19th century.
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