so this doesn't seem to be well known and i don't know what to do with bug proclamations but here it goes( as in it is going here, where it is). if you have a buildcraft hopper on top of a centrifuge, and possibly other forestry machines but i haven't checked, and put a drone into said hopper it will obviously go into the centrifuge; however if you then put another drone into the hopper it, too, will go into the centrifuge, but as the machine has only one input slot the second bee stacks and becomes an identical copy of the first, as will any subsequent drones(at least in the mindcrack pack). i say drone because given that they are the only bees that stack i assume it only works with them, though for the same reason i never tried with queens or princesses. one may wonder why i tried to centrifuge a bee, i didn't, it was just a misplacement during frantic un-automated comb and bee processing. this is pretty handy if you have many junk drones and only a few with good traits you'd like to isolate, but it's still an exploit, so i doubt any apiarist worth their salt would abuse it. i don't have the means to produce a video on the matter, so if you want proof you'll need to spend 23 second in a creative world trying it for yourself. if you bothered to read this far, thank you for your time lol