Melle Mel, an American hip-hop musician and one of the pioneers of rap as lead rapper and main songwriter for Grandmaster Flash, is credited for being the first rap lyricist to call himself an "MC" Thanks to Destiny's Child, the Oxford Dictionary officially added the word "bootylicious." Beyonce is the first female artist to have her first six studio albums debut at number one. The hair brush, lawn mower, cellphone, refrigerator, and the air conditioner are all thanks to African-American inventors. The real Betty Boop was actually an African American woman named Esther Jones. Beyonce's pregnancy announcement earned the Guinness World Record title for most tweets per second.