Endometriosis (say en-doh-mee-tree-OH-sus) is a problem many women have during their childbearing years. It means that a type of tissue that lines your uterus is also growing outside your uterus. This does not always cause symptoms. And it usually isn't dangerous.
A massive bell was required and the first attempt (made by John Warner & Sons at Stockton-on-Tees) cracked irreparably. The metal was melted down and the bell recast in Whitechapel in 1858. Big Ben first rang across Westminster on 31 May 1859. A short time later, in September 1859, Big Ben cracked.
'Big Ben' is in fact the nickname of the 'Great bell' - the biggest and heaviest bell in the tower at 13.5 tons, but it has become synonymous for the whole building itself, including the bell, clock and tower to be called 'Big Ben'.