In 1986, Waldemar Anguita acquired a patent for a helmet with cactuses inside. The idea behind the greenhouse helmet is quite reasonable, but the execution leaves much to be desired. From the description:
A principle object of the present invention is to provide a greenhouse helmet designed to contain plants secured within and the helmet worn completely over the head of a person so that the person can breathe in the oxygen given off by the plants.
Another object is to provide a greenhouse helmet that has air filters so that ambient air containing carbon…
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