But the deeper lines are trickier: space is so tight that there is nowhere for waste heat to go, which makes traditional air-conditioning impossible.
But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.
Heavier-than-air flying machines are impossible!
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"By that I mean try to imagine creating a cavity inside your mouth without any air bubbles and by letting in no air through your lips or throat -- it's basically impossible at sea level because the air pressure outside your mouth pushes the air pocket closed, " he said.
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Because the majority of its 47, 000 employees are air traffic controllers, it is impossible to cut its budget without affecting controllers, the agency said.
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While playing some slow-motion video of liquid flying through the air throughout the event, it was impossible to take our eyes off the thing.
Power lines and utility wires are virtually impossible to see from the air and account for many helicopter crashes each year when a pilot inadvertently flies into them.
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Then we hit something an air pocket, a hailstorm, it was impossible to tell.
Impossible I know, but Bel Air gave me this notion to prove common stocks over time increase household net worth.
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The approximate stand-still of global temperature during 1940-1975 is generally attributed to an approximate balance of aerosol cooling and greenhouse gas warming during a period of rapid growth of fossil fuel use with little control on particulate air pollution, but quantitative interpretation has been impossible because of the absence of adequate aerosol measurements.
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It will then self-destruct not in flames, its inventors hasten to add, but because contact with the air eventually renders its surface opaque, making it impossible for the laser in a disc player to read the data beneath.
Helicopters cannot fly to the area because the thin air disables their blades, making hauling this graveyard down nearly impossible.
However, Kieran Daly, from the online aviation news service Air Transport Intelligence, told CNN that this scenario, while not impossible, is inconceivable.
Yet even so, the Libyan operation would have been impossible without US involvement - both in actively bombing Colonel Gaddafi's air defences during the early days of the offensive, and in providing extensive intelligence and other support later.
At Sunday's jump altitude, the air pressure is less than 2% of what it is at sea level, and it is impossible to breathe without an oxygen supply.
In his brilliant 1991 design for Frankfurt's Commerzbank, the tallest office building in Europe, he brought off the seemingly impossible feat of building a supertower that could use natural ventilation (as against fuel-gobbling air conditioning) during 60% of the year.
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