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from the floods a bit later today. what we know right now -- hundreds of people have lost their homes, countless businesses destroyed, and rescuers are working to reach those who are still stranded by these high floodwaters. the extreme weather is impacting several states this morning. overnight in las vegas, heavy rains leaving multiple casinos and parts of the famous strip completely under water. we'll have more on that in a moment. we do want to begin with cnn's joe johns who is live in eastern kentucky, joining us with more on that historic flooding there. joe, good morning. >> r...

Dr. sanjay gupta explains in today's "chasing life." >> reporter: i'm dr. gustsanjay gupta with "chasing life" podcast. i've been interested with the idea that thoughts and emotions can tangibly affect our health and vice verse it. it's a reciprocal relationship. especially for gratitude. reflecting on what you're grateful for can objectively change the way your brain works. it does this by increasing serotonin and dopamine, hormones that make us feel good. it also does this by regulating stress hormones. and over time, this forges and strengthens pathways in our brains, as well. anyone can do...