I seem to have noticed (splitting all my wood by hand as I do) that some species of wood split really well green but then not very well at all after they've aged (e.g. yellow-poplar/tulip-poplar) and that other species are very difficult to split green (hickory, beech) but split pretty well if they've aged first. Has anyone else noticed that aging affects splitting ease differently according to species? If so, what are your observations?