These questions require you to understand what you've learned, and to use what you know to draw conclusions, make practical decisions, and to ask questions about what is yet unknown. To answer these questions you'll have to look at the big picture of what you've learned and put it all together into a practical useful package, then put it to use.

Science

1. What previous scientific discoveries do you think were essential to the discoveries made by each of these scientists? Explain your reasoning.

2. What unanswered questions remain about ãWhen is a little sunshine too much?ä Can these questions be answered using available scientific equipment? Explain your reasoning.

3. Using your UV-sensitive beads as the detecting device, design and carry out an experiment to show whether or not tree leaves can block UV radiation. Support your conclusions with evidence. What significance do your findings have relative to the practice of including green belts in urban areas?

Science and Society

1. One can buy swimsuits that are designed for an all-over tan. Using your UV-sensitive beads as the detecting device, design an experiment to demonstrate whether such special fabrics allow more UV radiation to pass through them than other types of fabric. Are the advertising claims justified? Given what you know about UV radiation and skin cancer, is sun tanning a wise thing to do?

2. Is ozone depletion thought to be the major cause of global warming? Support your answer with at least two additional resources.