Today on CNN 10, we see how major changes on one social media platform are affecting millions of teens around the world. We also check on a spacecraft getting the closest look yet at Mercury's craters, then learn about an annual celebration of nomadic culture. We close out with the inspiring story of a woman traveling the world against all odds, and a secret chamber discovered in a national capital. All this and more on CNN 10! Learn more about your ad choices. Visit podcastchoices.com/adchoices