1. Why Is The Sky Blue?

An explanation of lightning, including the amount of energy in a lightning bolt, how lightning is formed, and what we actually see in a streak of lightning. The group also explains about the different ways that attract lightning and how to prevent yourself from these strikes.

3. Why Does Breathing Helium Make Your Voice So High?

Sep, 1999

The discovery of how the density of several elements affects sound, what is needed for sound to be present, and how sound works. The pitch of a person's voice compared to that of a musical instrument is discussed, along with how changing the speed of sound affects the pitch of the voice, and how the pitch can be changed.

4. Why Don't Satellites Fall Out Of The Sky?

Explains what a satellite is, how it is put into orbit and how it maintains its orbit. The team also talks about how satellite dishes work and how they provide better television signals. The hosts clarifies interrelationships in earth/space systems, and information on the history of artificial satellites.

5. How Does The Dry Cleaning Process Work?

The revelation of why certain clothes are dry cleaned, the history of the dry cleaning process, and introduces water as a universal solvent. A demonstration is performed of how like-substances dissolve, and how emulsifiers break up oil-based stains.

6. Why Are Hurricanes Seasonal?

The exploration of why hurricanes strike only in late summer or early fall. The hosts also explain what a hurricane is, why it is the most destructive natural force on Earth, and demonstrates how to make a hurricane in the kitchen.

7. Why Do Voices Sound Different On Recorders?

The examination of how sound is produced and explains hearing by air conduction, and bone construction.

8. How Do Astronauts Land On The Moon?

The revealation of how a rocket actually gets to the moon, and how it is compared to flying to the moon as vacation.

9. Why Do High And Low Pressure Systems Bring Good And Bad Weather?

The explanation of atmospheric pressure and its relevance to the weather report and our daily lives. Also explained are pressure instruments and their uses, how isobars are mapped out, and how to read weather charts.

10. Why Do Some Rock Concerts Sound So Bad?

The definition of an echo, and the demonstration of how it occurs and its effects in different background. The hosts describe the acoustic challenges presented by most rock concert and presents some strategies to improve the sound.

11. How Do No Tears Shampoos Work?

How surfactant, the ingredient in shampoo that causes the burning sensation and helps rid the hair of dirt, reacts with the eye's tear film. And a look at amphoteric surfactants, which are found in 'no-tears' shampoo, and their properties.

12. How Do Artificial Flavours Fool Our Taste Buds?

A mass spectrometer analyzes the contents of a substance and displays the results on a computer. The human tongue and its ability to recognize four main tastes. The make-up of synthetic imitations and how they are created. Advantages of using artificial flavors rather than their natural counterparts.

13. How Is Snow Manufactured?

Information on how nature creates snow, the components used by snow-making machines to manufacture snow, and natural snowflakes compared to artificial ones.

14. How Are Athletes Timed In A Race?

The history of the stopwatch and analysis of its accuracy. The starter's pistol, the starting block sensors, and the horn in present-day races are used for timing modern races. How a high resolution video camera and computer technology help to determine the runner's finish time in a race - the finish time is the moment when the person's torso crosses the line.

15. How Do Bulletproof Vest Work?

The structure of a bullet- proof vest, including the characteristics of an Aramid fiber-energy absorption, stretching ability. How the strength of a fabric depends on how the fibers are woven together.

16. Why Do Some People Wear Glasses?

The explanation of the parts of the eye, such as the lens and the muscles surrounding it, the iris and its function of letting light into the eye, the retina, lined with light-sensitive cells shaped like rods and cones. How the shape of one's eyeball determines the eye's capacity to see.

17. Why Is The Ocean Salty?

The hosts talk about the two principle sources of salt. Underwater volcanoes and rivers, plus the different levels of salt concentration in rivers and ocean, and also the salt's tendency to absorb water. They also explain how salt reacts with body cells and the kidneys' role as the organs responsible for removing excess salt from the body.

18. What Are The Pros And Cons Of Being A Vegetarian?

The definition of carnivores and herbivores, - their respective diets and eating mechanisms. Human's teeth, digestive systems, and diet in comparison to those of carnivores and herbivores.

19. How Do We Determine The Age Of Dinosaurs?

Calculating the age of bones from the amount of carbon 14 they contain and the potassium atoms in rocks surrounding bones. Explanations of how bones help determine what the dinosaurs looked like, their habits, and their diet.

20. Why Is Gold So Valuable?

Gold's properties, its appeal to human beings and impact on society throughout history. The advantages of gold over other metals, its chemical stability where it does not react with water or air, measures of its purity in carats, and its use in high-tech equipment.

21. Why Does Fluoride Prevent Cavities?

What bacteria are and why they are so dangerous. Information on what eggshells and teeth have in common, what fluoride is and how it prevents cavities. The structure and function of living systems such as bacteria, the concept of causative agents, science in personal health, science in society, collaborative efforts of sciences, and environmental costs and benefits.

22. What Is A Computer Virus?

Feb, 2000