NASA's Perseverance rover has added to its trove of curious finds, as the space agency published a photo of a rock on the surface of Mars that looks like a centuries-old helmet. The rock has a pointed ...

KM3NeT is just such a detector array. It's submerged 3,450 meters (11,320 feet) under the surface of the ocean, a depth at which no sunlight can penetrate. In such complete darkness, neutrino events ...