Who would Ryan Coogler have been if, long ago, a teacher had not recognised and encouraged his raw talent? Those who watched the filmmaker walk the red carpet at the National Board of Review awards in the company of his college professor Rosemary Graham — a week before his genre-bending vampire musical Sinners broke the record for most Oscar nominations — may well have mused on the “what if” scenario. Coogler, who credits Graham with changing........

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