By all accounts, William Wrigley (1861-1932) is the "father of chewing gum." He transformed a small business selling soap into the top chewing gum manufacturer in the world. Although he did not invent chewing gum, it was his company that brought it to the world.
Sixth grade spelling words are an English speaker's first foray into the the sophisticated realms of orthography. They'll start learning about the patterns inherent to English spelling and hopefully come out of the sixth grade with a broader understanding of the language as a whole.