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We give an improved explicit construction of highly unbalanced bipartite expander graphs with expansion arbitrarily close to the degree (which is polylogarithmic in the number of vertices). Both the degree and the number of right-hand vertices are polynomially close to optimal, whereas the previous constructions of Ta-Shma, Umans, and Zuckerman (STOC '01) required at least one of these to be quasipolynomial in the optimal. Our expanders have a short and self-contained description and analysis,doi:10.1109/ccc.2007.38 dblp:conf/coco/GuruswamiUV07 fatcat:jia6lw4gyfaqhnfjswouoz6reu