Babies are born without kneecaps. They don't appear until the child reaches 2 to 6 years.

The coliseum in Rome was used regularly for about 400 years.

On the 20th August 2013 the world record for the world's biggest Lego-tower was smashed by a group of students from Delaware, USA. Their tower measured 112 feet in height and was constructed using more than 500,000 pieces of Lego!

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