RT @neiltyson: Dear @MarsCuriosity, Scientists conceived you, engineers designed you. But (cont) http://t.co/HlK9QdcO
RT @neiltyson: Dear @MarsCurio…
RT @neiltyson: Dear @MarsCuriosity, Scientists conceived you, engineers designed you. But (cont) http://t.co/HlK9QdcO
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