you can take a bunch of seeds or half grown plants into the crawl space of a house or even inside of the house and most of them will die.
remember we are co-dependent on plants to live
why arent more gyms equipped with sky lights or glass ceiling type gyms or retractable coverd ceilings to let in the fresh air in sunlight. i see this being the future of 'gyms'
i feel much better lifting weights in my backyard