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.
She is the second of four siblings, with one older brother, Daniel; one younger sister, Patricia (known professionally as Rooney Mara, also an actress); and one younger brother, Conor. Mara's father has Irish, German, and French Canadian ancestry, and her mother is of Irish and Italian descent.