toxicology

Alcohol is absorbed into the bloodstream within minutes of consumption, but the liver metabolizes it at a nearly constant rate of about one standard drink per hour, a rate that cannot be accelerated by food or hydration. The body treats ethanol as a toxin, converting it to acetaldehyde (more toxic than ethanol) and then to acetate through two enzyme-mediated reactions. Blood alcohol concentration (BAC) depends on body weight, sex, food intake, and genetics, making some individuals metabolically unable to process alcohol efficiently, as seen in alcohol flush syndrome. Once intoxicated, alcohol disrupts the balance of GABA and glutamate neurotransmitters in the brain, impairing judgment and coordination. Understanding alcohol metabolism reveals why hangovers occur, why some populations have lower tolerance, and why no trick can accelerate the clearance of alcohol from the body.

The geography cone snail moves at walking pace, cannot bite or scratch, and looks harmless enough to pick up from a beach. Its venom can kill an adult human within hours, and there is no antivenom. Venom is not a single thing — it is a convergently evolved chemical toolkit, independently invented more than 100 times across the animal kingdom, that does radically different things in different species. Here is what venom actually is, how it works at the molecular level, and why the most dangerous molecules on Earth are also among the most medically promising.