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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
There are more nerve cells in one human brain than there are stars in the Milky Way.
If you could remove all of your skin, it would weigh up to 5 pounds.