The International Space Station, like all human habitats in space, has a nagging mold problem. Astronauts on the ISS spend hours every week cleaning the inside of the station’s walls to prevent mold from becoming a health problem.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/6-spacestation.jpg)
Source:
https://phys.org/news/2019-06-space-station-mold-survives-high.html