Tuesday, February 21, 2017

A gigantic machine lays high-speed rail track girders so fast! China has more than 22,000 km of high-speed rail tracks, longest in the world.
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There's No Consistent Measuring System For Space, And It's Hurting Astronomy

There’s No Consistent Measuring System For Space, And It’s Hurting Astronomy ON  APRIL 19, 2018  BY  NARESH SAGAR LEAVE A COMMENT EDIT ...