2 ms·
http://www.ted.com/talks/bill_stone_explores_the_earth_and_space.html http://www.ted.com/talks/bill_stone_explores_the_earth_and_s...
by xiaoma 17y ago
http://www.ted.com/talks/bill_stone_explores_the_earth_and_space.html http://www.ted.com/talks/bill_stone_explores_the_earth_and_s...