Optical illusions occur when what the eyes see conflicts with what the brain expects.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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Scientists in Germany have developed a candy that doesn't cause cavities.
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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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Termites are being researched as a possible renewable energy source as they can produce up to 2 litres of hydrogen from ingesting a single sheet of paper, making them one of the planet’s most efficient bioreactors.
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