I am an oldest child and was a peaceful baby who slept when I wasn't eating. This left my mother unprepared for my future self or for my brother who left her sleepless.
My first experiments were in physics. They began at the age of a year and a half, learning to build potential energy by climbing the refrigerator. At two, I slipped away from my nap to play with gravity and friction on the slide two blocks away. The neighbours were very surprised to see me.