Snap, Crackle and Pop
Snap, Crackle and Pop are the cartoon mascots of Rice Krispies, a brand of breakfast cereal marketed by Kellogg's. History. The elf characters were originally designed by illustrator Vernon Grant in the early 1930s. The names are onomatopoeia and were derived from a Rice Krispies radio ad: The first character appeared on the product's packaging in 1933. Grant added two more and named the trio Snap, Crackle and Pop. Snap is usually portrayed wearing a chef's toque. Crackle often is shown wearing a red (or striped) tomte's tuque or "sleeping cap", and  Pop often wears a drum major's shako, but is sometimes also seen with a chef's toque, or an odd combination of both a shako and a toque. Corporate promotional material describes their relationship as resembling that of brothers. Snap is the oldest and is known as a problem solver, Crackle is an unsure "middle child" and known as a jokester, and Pop is a mischievous yet also clumsy youngster and the center of attention. There was briefly a fourth elf in the 1950s named Pow who represented the claimed explosive nutritional value of Rice Krispies. From their original  design as elderly gnomes with large noses, ears and hats, Snap, Crackle and Pop were reimagined with younger and more proportional features in 1949. Some time after 1955, their gnome-like oversized ears became more proportional yet pointed, as seen in common portrayals of elves. They first appeared as animated characters in 1959, targeted toward such children's shows as "The Howdy Doody Show". The voices of the original gnomes were provided by Daws Butler, Paul Winchell and Don Messick. More recent voices have included Chris Evans, Keith Chegwin, Chad Doreck, Eddie Deezen, Thom Adcox-Hernandez and Dino Andrade. As  of 2009, the three gnomes are voiced by Andy Hirsch (Snap), Danny Cooksey (Crackle) and Mark Ballou (Pop). As of 2017, the three gnomes are now voiced by Josh Brener (Snap), Ben Schwartz (Crackle) and Tom Kenny (Pop) The trio were used in conservation messages during World War II and briefly re-imagined as superheroes in the early 1990s, but later returned to their original elf-like form. Likewise, there was briefly a fourth gnome in the 1950s named Pow who represented the claimed explosive nutritional value of Rice Krispies. Leo Burnett Worldwide assigned Chicago-based cartoonist Don Margolis to  do Snap, Crackle and Pop for the Rice Krispies boxes as well as other applications. Davidson Marketing also used him for their Rice Krispies assignments. Don did the three gnomes until the end of 1998. On 17 June 2020, former UK Labour politician Fiona Onasanya questioned why popular breakfast cereal Coco Pops was promoted with a monkey, while Rice Krispies used the white-skinned Snap, Crackle and Pop. Physics. In physics, the terms "snap", "crackle" and "pop" are sometimes used to describe the fourth, fifth and sixth time derivatives of position. The first derivative of position with respect to time  is velocity, the second is acceleration, and the third is jerk.