1 The brain makes up about 2 percent of a human's body weight. 2  The cerebrum makes up 85 percent of the brain's weight. 3  It contains about 86 billion nerve cells (neurons), the gray matter.
Rooney Mara's Height is 5ft 3in (160 cm). American Actress best known for her portrayal of Lisbeth Salander in the US remake of The Girl with the Dragon Tattoo.
Early Life and Career: Rooney Mara was born in 1985 in New York. Rooneyâs father has Irish, German, and French-Canadian ancestry, and her mother is of Irish and Italian ancestry. It was 2010 when Rooney got her first leading role in the remake of A Nightmare on Elm Street.