“The American Federation of Teachers, the second-largest U.S. teachers’ union, said on Tuesday that it would start an A.I. training hub for educators with $23 million in funding from three leading chatbot makers: Microsoft, OpenAI and Anthropic. The union said it planned to open the National Academy for A.I. Instruction in New York City, starting with hands-on workshops for teachers this fall on how to use A.I. Randi Weingarten, president of the American Federation of Teachers, said the A.I.