Topical areas do overlap in some cases. The authors should use their best judgment to select the topical area with the best fit to their abstract. The abstract submission website now allows a second, optional topical area to be selected. The program committee may move abstracts to related topical areas if rearrangement produces better session flow or to accommodate schedule constraints. Researchers in computational physics are encouraged to submit their abstracts to a session that includes experimental work on their material system.