Plants use sunlight, water and carbon dioxide to make glucose and oxygen inside chloroplasts. Light reactions happen in the thylakoid, the Calvin cycle in the stroma.

ax² + bx + c = 0. Roots via the quadratic formula. Discriminant b² − 4ac tells how many real roots exist.

LAN covers a small area, MAN a city, WAN a country or the world. Topologies: bus, star, ring and mesh.