As people grow older, the same brain chemistry that once supported sharp thinking and stable mood can quietly start to work ...

Researchers have discovered how sperm cells perform an extraordinary metabolic transformation after ejaculation, from quiet storage mode to full-speed motion in their mission to fertilize an egg. In a ...

Enzymes are amazing catalysts. These proteins are made of nothing more than a handful of Earth-abundant elements, and they promote a vast array of reactions, convert chemical energy to physical motion ...

Enzymes originally evolved in high-temperature environments and later adapted to lower temperatures as Earth cooled. Scientists discovered that a key shift in enzyme function occurred over ...