Update for 3 p.m. ET: NASA has delayed the first flight of the Ingenuity helicopter on Mars until no earlier than Wednesday (April 14) after a final preflight test ended early. NASA is preparing to ...
THERE is a deep satisfaction to be had from making and throwing a paper plane. From the number I have had fly across my classrooms, I have been able to ascertain that most children over the age of 11 ...
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