His physics tutor , Robert Berman , later said , `` It was only necessary for him to know that something could be done , and he could do it without looking to see how other people did it . ''
[ 127 ] [ 128 ] His physics tutor , Robert Berman , later said , `` It was only necessary for him to know that something could be done , and he could do it without looking to see how other people did it . ''