In 2005, Nasa sent five geckos into space for 16 days without food or water
Five geckos flew on a 16-day space mission without food or water.
This experiment tested reptiles as models for microgravity research.
Laboratory analysis revealed changes in bone density and liver cell activity.
Researchers attributed these changes to housing and lack of provisions.
Geckos' specialized toe pads helped them adhere in weightlessness.
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