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Sierra Alpha Research President David Keller joined the "Investing with IBD" podcast this week for insights into his trading style and how investing in the stock market is a lot like being a student pilot. Plus, we analyzed three stocks holding up strong amid wild market swings, including Nike and AT&T. For the video version, show notes and charts, visit investors.com/podcast. Learn more about your ad choices. Visit megaphone.fm/adchoices