Today on CNN10: We'll get an update out of Southern California, where emergency crews are working to prevent an overheating chemical tank from spewing thousands of gallons of toxic chemicals into the surrounding environment. Then, we'll see how NASCAR honored one of their biggest stars following the sudden death of Kyle Busch last week. Plus, we'll sit down with 28-time Olympic medalist Michael Phelps to discuss the importance of mental health and hear why some of his biggest battles have come outside the pool. All this and more on today's CNN10!

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