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In tweaking its chatbot to appeal to more people, OpenAI made it riskier for some of them. Now the company has made its chatbot safer. Will that undermine its quest for growth?

This week the company announced that it would require users to undergo an A.I.-powered age estimation process in order to chat with others on the platform. Will this change reassure parents?

Scientists used tiny new sensors to follow the insects on journeys that take thousands of miles to their winter colonies in Mexico.