The chemical name for titin is 189,000 letters long, making it one of the longest words ever. If you tried to read it aloud, it would take about three hours! This giant word is basically a super detailed description of a protein found in your muscles, but don’t worry, no one actually says it. Instead, we just call it titin. If you tried writing it out, it would take up dozens of pages—imagine a whole book just for a word!

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