english: And then we were able to test them rigorously, in random-assignment, placebo-controlled designs, throw out the things that didn't work, keep the things that actively did.
non_english: i potom smo mogli da ih rigorozno ispitujemo u nasumično izabranim grupama kontrolisanim placebom -- izbaciti stvari koje nisu radile, zadržati stvari koje aktivno jesu.