lol, I hope that a donkey bridge is a used term in English? I'll explain it, just in case.. it is to make an associative link between things to be remembered. Is there any easy way to learn the structures of all the 20 aminoacids and whether they are polar/nonpolar/charged? It would be nice to be able to look at a missense mutation (one that changes the aminoacid of a codon) and predict by head whether that mutation will affect the characteristics of the protein or not. I guess I can start with putting the structures on my notebook's background..