This week: New research into using CRISPR to destroy cancer cells with other cancer cells and a study suggesting rodents aren’t immune to the sunk cost fallacy. Links: Cancer cells engineered with CRISPR slay their own kin https://www.sciencenews.org/article/cancer-cells-engineered-crispr-slay-their-own-kin Sensitivity to “sunk costs” in mice, rats, and humans http://science.sciencemag.org/content/361/6398/178