History had shown,he said, that such wars lasted many years and often destroyed both sides.

VOA: special.2009.03.19

Prof Seifert said the strikes would place the Liberal Democrats in particular under pressure because history had shown that about 40% of teachers vote Liberal Democrat.

BBC: Head teacher praised by David Cameron to strike

He said history had shown that establishing grammar schools was "extremely difficult and... often leads to them being very unpopular and they are then got rid of".

BBC: NEWS | UK | UK Politics | Cameron hits back over grammars

She said only 5% of people with melanoma had been shown to have a family history of the disease.

BBC: Twins offer skin cancer clue