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The one "invention" a intelligent spices has to invent is some form of energy to power the machines and industry. Fire is the start point. Electricity is a major step forward.
To invent objects pretty much requires a large brain, and a way to manipulate objects and the environment. So fingers on some way to make a hammer, plow, harvest equipment and on up the line of technology.
Even if dolphins were twice as smart as us, they have no way to make fire or manipulate products to make iron, steel, titanium, or refine gasoline. So fingers and air are just pretty much necessary.
"They" will have to have an atmosphere to work in, and have a way of manipulating things, and a way to move themselves around, so legs or some way to move about.
How have they remained undiscovered for the 100,00 years of humanity.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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