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Mars’s vanished northern ocean may have left two independent fingerprints: China’s Zhurong rover detected buried, sloping sand-and-gravel deposits resembling an ancient beach, while University of Arkansas researchers identified nine river deltas bearing the backwater geometry of rivers entering a vast standing body of water.
Earth may not have needed water-rich asteroids to fill its oceans. Oxford researchers found enough native hydrogen inside a meteorite resembling Earth’s original building blocks to explain the planet’s present water supply—suggesting water was a natural outcome of Earth’s formation rather than a lucky delivery from space.
The Golden State Killer was identified in 2018 not by a fingerprint or a witness but by a genealogy website where a distant relative had uploaded their DNA without knowing what it would eventually lead investigators to
A carbon-rich rock from eastern India has been dated to 3.497 billion years using zircon crystals deposited alongside it. Its isotopic fingerprint points to microbial carbon fixation, making it—according to its discoverers—the oldest directly dated rock with a confirmed biosignature and evidence that life was converting inorganic carbon into organic matter while Earth’s continental crust was still assembling.
