We know that interstellar objects occasionally visit our solar system. So far, we have only discovered two interstellar objects (ISOs), but that's mainly because we can only distinguish them from ...

A mysterious cylindrical object was found on the seabed by the Nord Stream 2 pipeline. Denmark has invited Gazprom, the Russian energy giant, to inspect it. It might provide clues as to who was behind ...

NTRODUCTION: The source of streamflow -- The origin of stream valleys -- The cycle of stream erosion -- Development of river hydraulics -- Development of fluid mechanics -- Quantitative geomorphology ...