Spain Investigates Deadly Collision Between Two High-Speed Trains

Today on CNN10: We'll get an update on the alleged computer signal failure that contributed to a deadly train crash in Spain. Then, we'll meet a team of students in South Korea who have developed a unique tool to help retrieve space junk orbiting our planet. Plus, we'll see which professional cheerleading organization just formed the sport's first union.  All this and more on today's CNN10!

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