It has been 50 years since the first Sephadex paper was published (1). Readers of BioProcess International work in a field that was fundamentally affected by what happened after that paper appeared in 1959. So this anniversary is certainly worthy of a party and a few speeches. But there are lessons to be learned, too. Here we take a look at threads connecting events before and after the discovery of gel filtration chromatography and introduction of the Sephadex product. Interdisciplinary…