Um, try again. One of the first composite aircraft was the Bolkow Phoebus sailplane designed in the 50's. It was built with a balsa core and glass fiber. Carbon fiber sailplanes began to be produced starting in the mid 70's.
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I have been working this schedule for the past 7.5 years and love it. I work on a military base and almost all of the base staff works this schedule. On non working Fridays the place is a ghosttown. An advantage of this is that there are savings in utility bills with no one coming into work on the off Fridays.