private void setPlayerResearch(ItemStack stack, String playername) {
List<String> researchesDone = ResearchManager.getResearchForPlayer(playername);
NBTTagCompound cmp = ItemNBTHelper.getNBT(stack);
NBTTagList list = new NBTTagList();
for (String tag : researchesDone) {
list.appendTag(new NBTTagString(tag));
}
cmp.setTag("research", list);
}