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What is the primary, vital function of the massive metal subway grates you walk over on the sidewalks of New York?

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What is the primary, vital function of the massive metal subway grates you walk over on the sidewalks of New York?

What is the primary, vital function of the massive metal subway grates you walk over on the sidewalks of New York?
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Transport

Staggering logistics of transporting massive wind turbine blades across the country require specialized trucks and expert drivers.

Moving a single blade, which can be longer than a football field, involves coordinating police escorts, modifying traffic lights, and precise steering from…

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Lockheed engineers designed the SR-71 Blackbird spy plane with titanium body panels that fit together so loosely on the ground that the aircraft actively leaked jet fuel all over the runway before takeoff.
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Lockheed engineers designed the SR-71 Blackbird spy plane with titanium body panels that fit together so loosely on the ground that the aircraft actively leaked jet fuel all over the runway before takeoff.

Lockheed engineers designed the SR-71 Blackbird spy plane with titanium body panels that fit together so loosely on the ground that the aircraft actively…

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Paul Cornu achieved the first manned free flight in a rotary-wing aircraft in 1907, managing to lift his incredibly dangerous twin-rotor machine about one foot off the ground for twenty seconds.
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Paul Cornu achieved the first manned free flight in a rotary-wing aircraft in 1907, managing to lift his incredibly dangerous twin-rotor machine about one foot off the ground for twenty seconds.

Paul Cornu achieved the first manned free flight in a rotary-wing aircraft in 1907, managing to lift his incredibly dangerous twin-rotor machine about one…

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In most four-door cars, the rear windows refuse to roll down all the way. It’s totally not a child safety feature.
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In most four-door cars, the rear windows refuse to roll down all the way. It’s totally not a child safety feature.

In most four-door cars, the rear windows refuse to roll down all the way. It’s totally not a child safety feature.

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San Francisco cable cars grab a cable underground
Transport

San Francisco cable cars grab a cable underground

Those picturesque trolley cars climbing impossibly steep hills don’t actually have motors propelling them forward. Instead, a massive centralized powerhouse…

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Largest wooden airplane ever constructed was famously nicknamed the Spruce Goose by a mocking press, despite the incredibly obvious fact that it was actually made entirely out of birch.
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Largest wooden airplane ever constructed was famously nicknamed the Spruce Goose by a mocking press, despite the incredibly obvious fact that it was actually made entirely out of birch.

Largest wooden airplane ever constructed was famously nicknamed the Spruce Goose by a mocking press, despite the incredibly obvious fact that it was actually…

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