overall inflammation in the brain possibly providing benefit to many brain diseases. we first heard rumblings about this in 2013, when we visited gw pharmaceuticals in the united kingdom. >> these flowering parts and the leaves around the flowering pots are coated with thousands of little balls. they're called tricons and the content is about 67% pure cannabinoid. >> gw's chairman dr. jeffrey guy and many others believe these precious chemicals are in fact neuroprotectants. >> not damaging, but protecting the brain? >> when brain cells are stressed by trauma or other injury. >> if you're skeptical, consider this. the u.s. department of health and human services has an actual financial stake in this exact sort of research. their patent, number 6630507, covers the use of cannabinoids as neuroprotectants.