Mysterious, spherical rocks litter the archaeological record — now researchers say there is evidence the balls were shaped on purpose. Plus, why a blockbuster superconductivity claim met a wall of scepticism and 2,000 unwanted rhinos get adopted. Mysterious, spherical rocks litter the archaeological record — now researchers say there is evidence the balls were shaped on purpose. Plus, why a blockbuster superconductivity claim met a wall of scepticism and 2,000 unwanted rhinos get adopted.
Physicist Ranga Dias and his colleagues have twice claimed to make a room-temperature superconductor. But many researchers question the evidence. Physicist Ranga Dias and his colleagues have twice claimed to make a room-temperature superconductor. But many researchers question the evidence.
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