David Feldman is an American author known for writing the "Imponderables" book series, which explores everyday mysteries, puzzling questions, and trivial curiosities about the world around us. Feldman has a talent for taking seemingly simple questions—such as why we say "cheese" when taking a photo or what keeps the snow on an angled roof from slipping off—and delving into their backgrounds to provide detailed, informative, and often humorous answers. With titles like "Do Penguins Have Knees?" and "Why Do Clocks Run Clockwise?" Feldman's books cater to those with a natural sense of wonder and an appetite for knowledge about the quirks and intricacies of daily life. His work is characterized by extensive research and a light-hearted, accessible writing style that makes learning about these "imponderables" both enjoyable and educational for readers of all ages.