“Atoms have a nucleus, made of protons and neutrons bound together. Around this nucleus shells of electrons spin, and each shell is either full or trying to get full, to balance with the number of protons-to balance the number of positive and negative charges. An atom is like a human heart, you see.”

“Atoms have a nucleus, made of protons and neutrons bound together. Around this nucleus shells of electrons spin, and each shell is either full or trying to get full, to balance with the number of protons-to balance the number of positive and negative charges. An atom is like a human heart, you see.”

— Kim Stanley Robinson