The following sentence is even more interesting: What is your goal in philosophy? That’s just for the fly in the bottle to know the way out. World War II Wittgenstein volunteered himself, as during World War I, but this time he sided with the British. Chicken Pot Pi. He served in a hospital, where, using knowledge and experience in aircraft assembly techniques, he built machines to measure pulse, blood pressure, pulse and breathing. Afterwards, he returned to Cambridge for another four years and then applied for early retirement at age 58.