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The reason why people often confuse the spellings "espresso" and "expresso" may be due to a combination of factors. First, the word "espresso" is of Italian origin, and the letter "s" is pronounced differently in Italian than in English. In Italian, the letter "s" is pronounced as a "z" sound, while in English it is pronounced as an "s" sound. This may lead some people to think that the word is spelled with an "x" instead of an "s." Second, the letter combination "es" followed by the letter "s" is not common in English words, which may make the spelling "expresso" seem more intuitive to some English speakers. Finally, it is possible that the misspelling of "expresso" has become common over time due to frequent use and repetition, even though it is technically incorrect.

There is some evidence to suggest that coffee can enhance certain aspects of memory, such as short-term memory and working memory. This is likely due to the effects of caffeine, which is a natural stimulant that can increase alertness, attention, and cognitive function. Several studies have found that consuming caffeine in the form of coffee can improve performance on tasks that require memory and cognitive processing, such as recalling information from a list or completing a complex mental task. However, the effects of caffeine on memory can vary depending on individual factors, such as genetics, age, and caffeine tolerance.