To celebrate the approaching 50th anniversary of the historic Apollo 11 Moon landing,... NASA has released a YouTube video showing scientists checking samples brought from the moon for any sign of life.<br />It's the first time such footage has been released.<br />In a statement explaining the video, a biologist said they had to be careful to avoid contaminating the samples, such as lunar rocks, soil, and dust.<br />So they had to sterilize every tool used in the process.<br />After several months of testing, the research ended with no life found.<br />
