New study finds microgravity disrupts sperm and embryo development, raising concerns about human reproduction in space.

And the 58th generation of mice did not survive, establishing for the first time that mammals cannot be cloned an infinite number of times. This method of cloning clones had raised the hope of being ...

Research findings are available online in the journal Communications Biology. The original story “ Getting pregnant in space ...

Making babies in space may be more complicated than expected, as new research shows sperm struggle to navigate in microgravity. Scientists found that while sperm can still swim normally, they lose ...

Sexual reproduction is essential for mammals to eliminate harmful genetic mutations that build up through cloning, a research ...

As the generations dragged on past the 27th iteration, the birth rate began to silently collapse. By the 57th generation, a mere 0.6 percent of the cloned embryos survived. The 58th generation ...

Cloning can recreate an animal almost exactly, at least at first. But with each generation, small genetic changes begin to stack up. In a 20-year experiment, researchers repeatedly cloned mice from a ...

Sperm may lose their ability to navigate in microgravity, raising new questions about whether human reproduction is possible ...

A new study suggests humans face barriers to reproducing in space, with microgravity disrupting sperm movement.

Can you clone a clone forever? Landmark 20-year study reveals horrifying verdict - Scientists cloned 1,206 mice from one female donor over 20 years to test the limits of cloning ...

A long-term cloning study reveals how genetic mutations build up over generations, exposing a critical limit to cloning in ...