People often think a dog's mouth is cleaner than a human's mouth. According to Dr. Leni K. Kaplan of Cornell University College of Veterinary Medicine, the reason people believe this because when a dog licks a wound, it can remove debris and contamination, which sometimes expedites the healing process.

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Inventor Lonnie Johnson stands with his Super Soaker water guns at JTEC Energy on Wednesday, Oct. 29, 2025, in Atlanta. Johnson, a former NASA engineer, is currently working on a new energy technology through his company’s JTEC device that turns thermal heat into usable energy. (Natrice Miller/AJC)