Pawan’s Reviews > Ignition!: An Informal History of Liquid Rocket Propellants > Status Update

When the author described Hypergol, all I could think of was Algol. It would have been more engaging to read had the author mentioned the formula and oxidation equations.

Festival fireworks use solid fuel and so do objects that need to follow a predefined trajectory (usually just once). Liquid fuel enables maneuverability, throttle control and the vehicle can be recovered for reuse. SLS and LVM3 use both.