Cells make their largest decisions at a few regulatory hubs: AMPK, which senses energy; mTOR, which decides whether to grow; p53, which guards the genome; and NF-κB, which coordinates inflammation and immunity. These hubs regulate one another in a web rather than a chain of command, but they have something in common. AMPK reads the ratio of AMP and ADP to ATP directly. mTOR checks the supply of S-adenosylmethionine through a dedicated sensor. p53 carries acetyl, methyl, ubiqu

Adenine––The First Intelligent Molecule Life did not begin with cells, organs, brains, or nervous systems. Some molecules possessed such extraordinary chemical and physical properties that they repeatedly became the foundation for increasingly complex intelligent biological systems. Among them, one molecule stands out above all others—adenine. Perhaps the reason adenine was the first truly intelligent molecule is the remarkable number of ways it can interact with its surround