❤️🩺 Turn Valentine’s Day into a meaningful science experience with this hands-on heart rate STEM lab!In this Junior Cardiologists Lab, students investigate how physical activity affects heart rate while learning how to design a fair test, collect data, and explain results using evidence. This Valentine’s Day science activity is engaging, movement-based, and classroom-tested for 3rd, 4th and 5th grade. Perfect for February science lessons, STEM days, or human body systems units! 🔬 What