National Geographic History on Instagram: "More than six decades after her grandmother uncovered the famous “Nutcracker Man,” Louise Leakey has unearthed a long-lost piece of the puzzle: a fossilized hand. Nat Geo Science Editor Nicholas St. Fleur @scifleur explains how the 1.5-million-year-old bones may finally reveal whether Paranthropus boisei—once thought too primitive—was capable of crafting tools after all. Learn more at the link in bio."