Why does dark matter seem to vanish in our cosmic backyard?

Surveying galaxies within 12 megaparsecs, this review catalogs six places where the standard cosmological model quietly fails at small scales. The most striking: the local dark matter density clocks in at Ω_m = 0.08, versus the globally accepted 0.30 — a factor-of-four gap. Whether this reflects a genuine local underdensity, measurement bias, or a crack in ΛCDM itself remains unresolved.