1. Not supposed to.
2. We use the every other year rule, but I've seen them go longer.
3. Not finding acorns is a could be a good thing.....I hoe and pray every day that we dont have an acorn crop this year. When there is no acorn crop and you do find an oak that is dropping "preferably a white oak" the deer will be more concentrated and imakes hunting so much easier. We have had a mass crop for a few years running and pattering deer after the crops are gone and the persimmons are gone is almost impossible.