Chris BaraniukTechnology Reporter
Less than 10% of users are expected to need to verify their age when the company does roll out the process later this year, he added.
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Helium is used to pressurize tanks and help push fuel into the engines. Without proper helium flow, the rocket cannot safely fly. Because the upper stage is hard to reach at the launchpad, NASA rolled the stacked rocket back into the Vehicle Assembly Building, the sky-scraping hangar where it was originally put together.，详情可参考同城约会
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