Digest: What keeps sexual signals honest? A general new explanation.

One of the most tantalizing phenomena in evolutionary biology has just received a new, elegant mathematical explanation. Rather than relying on the much-contested handicap principle, Fromhage and Henshaw's simple new model is based on resource trade-offs and explains why keeping costly sexual signals honest is evolutionarily optimal. Complications such as the supposed inherent wastefulness of the handicap principle, or social punishment of dishonest cheaters, are no longer needed to explain honesty in sexual signaling.