4.5 pounds of sunlight strike the Earth each day.
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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0.3% of solar energy from the Sahara is enough to power the whole of Europe.
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Diamonds can be shattered with a hammer.
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Iron weighs more after it rusts.
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Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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