The word Principal refers to a senior person of an organization like school or college principal. Whereas, the word Principle refers to doctrine or fundamental truth. These are similar-sounding words.
Because of how some words in English sound or are spelled, they are frequently used interchangeably. English is a difficult language. Even while we are aware that the words are distinct, our computers' spellcheck and our phones' autocorrect occasionally trick us with their corrections and make us believe differently. But if you want to communicate effectively, you must be fluent in the language you choose to employ. Thus, we must take care of similar-sounding words.
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To emphasize the drop in life expectancy in Africa.