Bennu's near-Earth lifetime of 1.75 million years inferred from craters on its boulders. - Ballouz RL; Walsh KJ; Barnouin OS; DellaGiustina DN; Asad MA; Jawin ER; Daly MG; Bottke WF; Michel P; Avdellidou C; Delbo M; Daly RT; et al. (Nature, 2020)