Also, floating in prolonged zero gravity can cause acute medical conditions, such as irreversible changes to blood vessels in the retina, leading to vision degradation, and the skeleton can leach calcium and bone mass.
The greatest fear is that cyanide, which is used to leach gold from ore, will drain downhill and poison Esquel's and possibly the park's water supplies.
And it can leach joy and imagination from their pursuits.
Urine batteries The Problems: Batteries are difficult to dispose of and contain harmful heavy-metal compounds that may leach into the soil.
