Mike Massimino (@Astro_Mike)
@Astro_Mike
Former @NASA Astronaut, NY Times Best Selling Author of #Spaceman#, Professor at @Columbia, Sr. Advisor @IntrepidMuseum
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I am amazed by the sheer size of The Great Wall of China - stretching over 13,000 miles (21,196 km) and built across more than 2,000 years. I am grateful I had the opportunity to visit and experience a small section of it.
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