Gigerenzer researches at the Max-Plank-Institut für Bildungsforschung about rational and intuitive decision-making among other things. The institut is a great 70s building with so many interesting spots and backgrounds I could hardly make up my mind. Kindly enough the professor tolerated my temporary decision-making deficiencies and patiently let me take his portrait before concrete walls, in green yards and even next to an interesting garbage shack.