In today’s Discovery: Humans are getting closer to traveling faster than the speed of light, scientists uncovered what mysterious stone megastructures in the Andes were used for, and we’ve added audio to a reader favorite on the strange landforms in Washington that fooled geologists for decades. 

But first: Louise Leakey found a 1.5-million-year-old fossilized hand. Her discovery could unlock an ancient mystery.  

Some sixty years after her grandmother discovered “Nutcracker Man,” Louise Leakey unearthed his long-lost hand—reviving a family debate about ancient toolmaking and adding to the Leakeys’ rich legacy in the field of paleoanthropology.

Today’s newsletter was edited and curated by Sidney Madden and produced by Amanda Petty. Did someone forward this to you? Sign up for our other newsletters here.