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In 1988 the U.S. government wanted to see how strong reinforced concrete was, so they performed the “Rocket-sled test” launching an F4 Phantom aircraft at 500mph into a slab of it – formidable

In 1988 the U.S. government wanted to see how strong reinforced concrete was, so they performed the "Rocket-sled test" launching an F4 Phantom aircraft at 500mph into a slab of it

In 1988 the U.S. government wanted to see how strong reinforced concrete was, so they performed the "Rocket-sled test" launching an F4 Phantom aircraft at 500mph into a slab of it – contemporary