This report examines The Cat in the Hat Knows a Lot About That! ™, a PBS KIDS multi-platform media property based on “The Cat in the Hat’s Learning Library” book series by Random House and Dr. Seuss Enterprises. Conducted by EDC and SRI International, the study’s goal was to understand the extent to which providing access to media resources focused on critical science and engineering concepts can help children living in low-income households learn. Exposure to The Cat in the Hat Knows a Lot About That! resources had meaningful impacts on 4- to 5-year-old children’s physical science knowledge and their ability to engage with science and engineering practices.