Today, we check in on the so-called "migrant caravan" that had been traveling through Mexico. The migrants, many of them from Central America, reached Tijuana over the weekend. We'll check in on that, and also look at the history of migration from Central America to the United States. Plus, The World's Carolyn Beeler reports on the launch of a new effort to measure the relationship between melting ice shelves in Antarctica and rising sea levels worldwide. Plus, why officials in Venice have installed turnstiles at key access points to the city's historic center.
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