As you walk across the plank that connects Brooklyn to lower Manhattan, you are transported from a world of electricity, hot water, and street life, to one that feels like a dark movie set.

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In many cases, like sanitation or water, making progress solving these challenges is a matter of life and death for millions of people every day.

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While Earth orbit is vital, keep in mind that visionaries like Elon Musk have in mind a human journey to Mars to look for signs of water and life.

WHITEHOUSE: Space Community Leaders on Historic Berthing of Dragon to the International Space Station | The White House