Tricycle
A tricycle is a three-wheeled pedal vehicle primarily designed for children to learn balance and ride safely.
Estimated value as of 2026 · Source: Average retail price for children's tricycles from major retailers like Amazon, …
Fun Fact
The first pedal-powered tricycle was invented in 1839 by Scottish blacksmith Kirkpatrick Macmillan, predating the bicycle and serving as a crucial stepping stone in human-powered transportation.
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Blimp
A blimp is a type of non-rigid or semi-rigid airship used for advertising, passenger rides, and aerial observation, with the Goodyear Blimp being the most iconic example.
Space Shuttle (per mission)
The Space Shuttle program conducted 135 missions from 1981 to 2011, with the total lifetime cost averaging $1.5 billion per mission when including all program overhead from development through retirement.
Dragline
A dragline is a massive heavy excavator used in surface mining for removing overburden, featuring a long boom and bucket dragged by cables.
Tunnel Boring Machine
A Tunnel Boring Machine (TBM) is a massive heavy equipment machine used to excavate tunnels with a rotating cutting wheel, typically employed in large-scale infrastructure projects like subways and highways.