many-limbed beings that are invariably described as a cat o'nine tails with a fattened handle. Their body composition includes ultra-cold superfluid helium. Outsiders are estimated to be the most advanced species in Known Space, possibly the Galaxy, but the extent of their development remains unknown. Though they have the technology to produce advanced faster-than-light drives, they rarely use them, preferring to travel the "slow" way, just below the speed of light. They do possess a "reactionless drive" technology that allows them to reach this speed almost instantaneously. In Ringworld's Children Louis Wu says that the Outsiders have "something better" than hyperdrive but this is not elaborated on. They spend all of their time following starseeds and acting as information brokers to space-faring sentient races throughout the Milky Way. Their prices can be very high and scaled to the estimated impact the information will have on the civilization of the client race. Their most common wares are interstellar propulsion systems of various types. The Outsiders maintain a strict commercial ethos regarding any form of knowledge, which shrouds them in a secrecy only wealth can penetrate. They do not haggle. They will answer any question, even those about themselves, if the questioner is willing to pay the price. Personal questions about the Outsiders have been priced beyond the ability of any individual or government to pay (on the order of a trillion credits). In "Peace and Freedom", it is revealed that starseeds are in fact packages of microorganisms designed to seed new planets with life, thus creating new customers for the Outsiders. They are reluctant to reveal this information because they are ashamed, since one of their starseeds created the Thrintun, a species which destroyed nearly all intelligent life in the galaxy several billion years ago. Another theory behind the Outsiders-Starseed connection is that Starseeds actually carry Outsider 'spores'; as the Outsiders are a small-numbered species their offspring are of great importance to them. The Outsiders are thought to have evolved on a cold world with no atmosphere, similar to Neptune's moon Nereid, which they lease from the Earth government. They live on thermoelectricity by lying with their heads in sunlight and their tails in shadow; the temperature difference sets up a current. In some of the later Known Space stories it has been suggested that the Outsiders do not use hyperspace as its conditions are lethal to them because they would