The Moscow Kremlin is the world's largest medieval fortress. The total length of the Kremlin walls is 2,235 metres

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Colour change, depending on where you live

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Flamingos do not turn pink from birth, but because of their diet. They eat blue-green seaweed, which turns pink during digestion

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The verb "set" has 430 meanings - it is the most polysemous word in the English language

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In Japan, tattoos are associated with the criminal world. People with visible tattoos are banned from many places

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The Hawaiian alphabet has 13 letters

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The cologne (fr. eau de Cologne) first appeared in the German city of Cologne

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Tomatoes contain choline, which helps lower blood cholesterol levels, promotes haemoglobin formation and strengthens the immune system

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Raccoons have thousands of receptors on their paws, allowing them to detect object properties with great accuracy

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A domestic cat can reach speeds of up to 50 kilometres per hour over short distances

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The first jeans were all indigo and the dye was made from ashes

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Your fingerprints have 40 unique characteristics and your iris has 256

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Kiwis are great for losing weight and boosting your immune system

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Horses have a great memory. They can remember their abuser for life, but they don't forget their friends either

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The ship's vaults on the Titanic held $250 million worth of diamonds

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Horseshoe-shaped magnets are there for a reason. This shape allows them to bring the poles closer together and therefore enhance their magnetic properties

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A domesticated fox breed was bred in the 1960s in the USSR

Now it's worth about ₽500,000

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Algae up to 200 metres long grows in the waters of the Pacific

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Wine cellars in Hungary that look like a Hobbit village

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August has the highest birth rate

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Men with high testosterone levels are less likely to be unemployed

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