People from different scientific disciplines don't understand each other. Bring them together and at first you have tribal warfare. Breakthroughs happen when the synthetic organic chemist and the solid state physicist actually begin to talk to each other with understanding. Now add the computer scientist and the biologist, and you're getting somewhere. Molecules just want to switch.
Many molecules can assume different states.
That's a memory. The state of one molecule can afford the state of another. The general principle is, reinvent the computer, not the transistor. Let molecules do what they want to do, and what they want to do is switch. If you grow your computer you can afford it.