nasa engineer

Mark Rober, a former NASA engineer, demonstrates the fluidized effect of air pressure on the sand in the video that attracts more than 5.7 million views on YouTube, according to

Cases that caught UFOs from cone-shaped blue light trails appeared in the sky to a strange spaceship cloud that often caused fever on the Internet, drawing a lot of controversy

Engineers at NASA have created such a durable knife that you never have to grind it.