What was las gorras blancas? what was its goal?

Who were some of the first people to use prostheses?

Explain the significance of martin luther king jr's letter from a birmingham jail and i have a dream speech

What event started the space race and made americans feel their security was threatened a.) alan shepard's suborbital flight. b.) the launch of sputnik c.) the launch of explorer d.) the cuban missle crisis