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On the surface of Mars, there are numerous features that tell of a past age when the planet was warmer and wetter, with rivers, lakes, and even an ocean that covered much of its northern hemisphere. These include river channels, delta…

Human sperm can swim through surprisingly viscous fluids with ease – and they seemingly defy Newton’s third law of motion to do so.

To figure out how they slither through substances that should, in theory, resist their movement, a team led…