The Channel Tunnel required underwater tunneling through chalk marl.
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The printing press revolutionized the spread of knowledge in Europe.
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About 90% of all the data in the world was created in the last two years.
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The sewing machine sped up clothing production.
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The solar panel converts sunlight into electricity.
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More than 90% of the world's currency exists only digitally — not as physical cash.
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The first video game ever sold commercially was Computer Space in 1971, before Pong.
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Photography was originally called 'sun painting' — the word comes from Greek for 'light writing.'
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Iceland runs almost entirely on geothermal and hydroelectric energy — it is one of the greenest countries on Earth.
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