Another book we've read for school is How to Make an Apple Pie and See the World. We read this one back in September also, timing it with the apple harvest. It's a fun book, in which the market is closed so the main character travels around the world to gather all of the ingredients.
On her way to Jamaica for some sugar cane, she gets a jar full of sea water for the salt. Since we didn't have any seawater, we measured out some salt and mixed it with water, then we put it on low heat on the stove to evaporate the water (the book just said to let it sit for several hours/days, but we decided to speed up the process). The end result was a pan of salt (and a stove top covered in salt as you can see), which we measured again to show that it was the same, or close to it.
Don't worry...everything is cooled now-I didn't let them work with a hot stove:)
(also as a side note, this also happens to be the same day that Addie locked herself into the bedroom. It took me about 20 minutes, taking off the door knob and calling Matt to get her out!... Not a great day, but since then our friends gave us a long skinny screwdriver that works much better).
My favorite thing about this book was the geography. Everyday we would mark where she traveled around the world. It exposed the kids to some new places and how they are similar or different to where we live. We also ended the week by making an apple pie of course! (our trip to the orchard was cancelled due to weather-and the fact that we had already received about 100 apples from Aunt Jodi).