HOUSTON — You’ve probably heard of palindromes. They’re strings of characters or words that read the same backward as they do forward. They’re words like ‘mom’ and ‘dad’ and names like ‘Anna’ or ‘Bob.

You’ve probably heard of palindromes. They’re strings of characters or words that read the same backward as they do forward. They’re words like "mom" and "dad" and names like "Hannah" or "Bob." They ...