He turned to his other hobby which was firing guns, but after some minor problems with the police and the Dutch army he had to give that up as well and was forced to pursue a career in physics.
Siya yari sa kanyang iba pang libangan na kung saan ay grupo ng nagpapaputok baril, ngunit matapos ang ilang mga menor de edad problema sa mga pulis at ang mga Dutch hukbo niya na magbigay na up na rin at sapilitang ay upang humanap ng isang karera sa physics.