When Newman T. Baker first tried to play the washboard years ago, he had what he describes as an almost out-of-body experience. Though he had never played before, his hands seemed to glide over the ribbed surface of the board as if, he said, “my ancestors were showing me how to play.”

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How nations can best allocate COVID-19 vaccines remains a discussion of global importance. And at its heart is the question of whether countries with greater access to vaccines should focus on vaccinating their own citizens or sharing their vaccine allotments with other nations.

While...