[lemma=certain] □
[lemma=certain] [□]
[lemma=certain] []
Which is to say that neither they , nor many other scientists ( myself included ) are anywhere near as certain as Weinberg that we are , or ever will be , in a position to prove that " nature is strictly governed by impersonal laws " . But it seems as certain as such things can be that different leaders would have produced different , and less happy , results . To allocate staff and financial resources and engage the time and cooperation of the persons in the programs to be studied without making as certain as possible that what is proposed will work is to court serious problems . Earlier ruptures are less certain as suggested by queries in the figure below . The user would never be able to certain as to the source of the information they are seeking .