Famous people died in 21 April

Nina Simone was one of the most iconic American musical icons of the 20th century

Prince Rogers Nelson was an American singer widely regarded as the pioneer of Minneapolis sound

Shakuntala Devi was an Indian writer and mathematical prodigy popularly known as the "human computer"

Aldo Leopold was a renowned American ecologist, environmentalist and scientist

Mark Twain was an American author and humorist

Michelle McNamara was an American writer who is rated as one of the best among some of the recent eminent crime writers and bloggers

Sir Edward Victor Appleton was an English physicist who won the Nobel Prize in Physics in 1947

Muhammad Iqbal was a philosopher, poet and politician in British India and is regarded as being the inspiration behind the Pakistan movement

Henry VII was the King of England and first monarch of the Tudor Dynasty

John Maynard Keynes was the most influential British economist of the 20th century