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If on the other hand, they are used to information questions, they may ask, "Which states joined the Confederacy? What were the six main causes of the war? What happened at Shiloh? Who was the Union commander at Shiloh? When did the war end?"

If you ask many tantalizing and divergent questions in your classroom, your students are likely to model after your behavior for example, "What would have happened if Lincoln was shot in the first month of the war? Why did Lincoln only free the slaves in the rebel states? How did it feel to be a woman in the path of Sherman's army?"

The four rules of brainstorming: 1. all contributions are accepted without judgment; 2. the goal is a large number of ideas or questions; 3. building on other people's ideas is encouraged; 4. farout, unusual ideas are encouraged.

This website documents, in great depth, a large collection of chemical elements and examples of their applications, common and uncommon. Click any element tile above and you will find probably more than you ever wanted to know about that element. All these samples (well, at least the ones that fit) are stored in a wooden periodic table, by which I mean a physical table you can actually sit at, in my office at Wolfram Research. I decided to build this table by accident in early 2002, as a result of a misunderstanding while reading Uncle Tungsten by Oliver Sacks. I won't bore you with the details here (see the Complete Pictorial History of the Wooden Periodic Table Table), but once it was finished I felt obligated to start finding elements to go in it (because under the name of each element in my table there is a sample area). Then I started building a website to document all my samples, and that's when things really got out of hand. A few months later my little table won the 2002 Ig Nobel Prize in Chemistry, clearly the highest honor for which it is eligible. Sensing an audience, I began to take the website more seriously, which led to my being asked to write a monthly column for Popular Science magazine, which I've now been doing continuously since the July 2003 issue. Later I formed a most satisfying partnership with Max Whitby building high-end museum displays, selling element samples and sets, and filming video demonstrations of the chemical properties of the elements. This website now contains the largest, most complete library of stock photographs of the elements and their applications available anywhere, as well as a large and growing collection of 3D images documenting hundreds of samples rotated through 360 degrees. Try clicking on some elements in the table above: I think you'll be surprised what's lurking behind those little tiles. And if you like the pictures, you'll love the poster! After years of photography and months of assembling images, I published a photographic periodic table poster based on my collection: