Two-year old French startup Mistral wants to show that European AI can compete with American and Chinese companies that dominate the industry. WSJ tech reporter Sam Schechner reports from the Viva Technology conference in Paris. Plus, the United Nations estimates half of all people on Earth experience severe water scarcity at least one month of the year. WSJ tech columnist Christopher Mims tells us about a 1960s-era technology that might hold a key to easing that problem.

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