Vasovagal syncope is basically a misguided effort by the vagus nerve: In trying to make you chill out, it overshoots and instead makes you pass out.
One toke and I'm out.
Disclaimer: We do not endorse drug use but if you are going to be an idiot today, you should at least be safe.
Astronauts’ arteries undergo troubling changes in space. A Canadian scientist is trying to figure out why.