In 2015, scientists sent amputated flatworms to the space station; one returned and regrew two heads instead of one

Flatworms subjected to the unique environment of the International Space Station returned exhibiting surprising double-headed regeneration. Upon their return, some of these worms demonstrated paralysis and showed less inclination towards darkness compared to those that remained on Earth. A detailed microbiological assessment indicated notable changes in bacterial populations and specific proteins, hinting that the effects of space travel influence biological systems on multiple fronts.
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