Presents an introduction to electricity, discussing the principles of currents, conduction, circuits, and voltage, along with instructions for simple experiments that demonstrate these principles.
Recounts the history and effects of the bubonic plague, describes how the disease spread, and offers information about treatment and prevention in the modern world.
Presents an introduction to light, discussing the principles of refraction, lenses, color, ultraviolet and infrared light, and solar power, along with instructions for simple experiments that demonstr
