Gordon Penrose

• Dr. Zed's science surprises
• Dr. Zed's sensational science activities
• It's Dr. Zed's brilliant book of science experiments
• Magic Mud
• Magic mud and other great experiments
• More science surprises from Dr. Zed
• Science Fun
• Science Surprises
• Sensational science activities with Dr. Zed
• [Dr. Zed's] Magic Mud and Other Great Experiments
• Bubble Splash Zoom!
• Doctor Zed's Zany Brilliant Book of Science Experiments