i also recorded my experiments , like the time i cut my forearm with a knife just to see if i would bleed ( which i did , a lot ) and carefully noted how long it took to heal ( about twenty-four hours , from when i made the cut to when the little pink line completely disappeared ) , the time i spoke swahili to a man in the san francisco airport ( imagine the surprise for both of us ) , or how i could do twenty-five grands jetes back and forth across the floor of the ballet studio without getting winded .