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In Shark Alley, South Africa, people often go underwater in protected environments to watch sharks in their natural surroundings..

Some people believe this makes the sharks more violent. Others feel there´s no change in behavior. Two researchers want to find the truth.

How do they study sharks?
What do they find out?

Welcome the sights and sounds of the world with Footprint Reading Library. Accompanied by original video material developed by National Geographic Digital Media, this is the first non-fiction reading series present fascinating real-world stories in three formats: print, audio, and video.

Level B2 - Upper Intermediate - 2200 headwords.