Today on CNN10: We'll get the latest on a series of shark attacks that have forced the closure of dozens of beaches in Australia, and learn why weather trends could cause more encounters. Then, we'll see what's driving the decision to drastically reduce speed limits in one of Europe's most storied cities. Plus, we'll take a look at a remarkable discovery that's changing our understanding of cows' cognitive abilities. All this and more on today's CNN10!

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