Transportation

TL0 – Skis; dogsleds; dugout canoes.
TL1 – Bare horseback; the wheel (and chariots); ship-
building; sails.
TL2 – Saddle; roads; triremes.
TL3 – Stirrups; oceangoing sailing ships (longships,
roundships, etc.).
TL4 – Stagecoach; three-masted sailing ships; precise
navigation.
TL5 – Steam locomotives; steamboats; early sub-
mersibles; balloons and early airships.
TL6 – Automobiles; continental railways; ocean liners;
submarines; aircraft.
TL7 – Nuclear submarines; jet aircraft; helicopters;
manned space flight.
TL8 – Satellite navigation; SSTO (“single stage to
orbit”) spacecraft.
TL9 – Robot cars; space elevators; manned interplane-
tary space flight.
TL10 – Fast interplanetary space flight.
TL11 – Manned interstellar space flight.
TL12 – Fast interstellar space flight.
Superscience! Reactionless thrust; contragravity;
faster-than light (FTL) travel; matter transmission;
parachronic technology; time machines.