Observations+and+Inferences

Materials

 * string cheese
 * almond or brazil nut sliver
 * lighter
 * candle holder (optional)

Procedure
Before class begins, take a piece of string cheese and cut into 3rds or 4ths. Insert an almond or brazil nut sliver into the top so it resembles a candle. If you don't cut it evenly, a candle holder might be helpful.After explaining to students the difference between observation and inference, put your "candle" on the table and ask students to make observations without telling them what you have. Then have them make inferences. Usually, at least one student will say that you can light it.So light it! Have them quickly make observations and then inferences. This needs to be done in about 30 seconds because that's about all the nut sliver will burn. Without saying a word, blow out the candle, pop it into your mouth and eat it.Ask students if they'd like to make a change in their observations or inferences. Did they learn something once you ate the candle?Students should then be in a position to discuss how scientists constantly change understandings about the world around them based on new observations...allowing them to make new inferences.