CC BY-NC-SA 3.0 UnportedDavis, Diana2022-08-042022-08-042015https://oa.tib.eu/renate/handle/123456789/9845http://dx.doi.org/10.34657/8883Billiards, the study of a ball bouncing around on a table, is a rich area of current mathematical research. We discuss questions and results on billiards, and on the related topic of flat surfaces.enghttps://creativecommons.org/licenses/by-nc-sa/3.0/510Geometry and TopologyReport8 S.