Jamie looked at the water glass, then at the phone. For the first time, the world didn't feel like a slide into stillness. It felt like a million tiny, defiant pumps working in the dark, spending everything they had to keep the impossible thing— life —running uphill.

This is happening in your body right now—it’s how your brain sends electrical signals! 2. Secondary Active Transport (Cotransport)

“Active transport,” she announced, capping her marker with a sharp click . “Who can tell me what it is?”