Dr. Joe, M.D. on Instagram: "Yes, poppy seed muffins really can cause a failed 💊 test… and they’re not the only thing. Some everyday foods and drinks contain compounds that can cross-react on 💊 screens and give you a false positive. Here are some surprising examples: • Poppy seeds → can look like opiates • Tonic water (quinine) → can look like opiates • Certain diet pills or weight-loss supplements → can look like amphetamines • Hemp foods (hemp seeds or hemp oil) → can show up as 🌱 • Energy

Introduction to eigenvalues and eigenvectors