We show that a certain class of varieties with origin in physics generates (additively) the Denef-Loeser ring of motives. In particular, this disproves a conjecture of M. Kontsevich on the number of points of these varieties over finite fields.
"Matroids motives, and a conjecture of Kontsevich." Duke Math. J. 116 (1) 147 - 188, 15 January 2003. https://doi.org/10.1215/S0012-7094-03-11615-4