The document discusses the difference between observation and inference. Observation involves directly observing facts using senses without making guesses, while inference uses observations to make an educated guess or opinion about something. It provides an example where observing a leaking green liquid from a brown can leads to the inference that the can is old and leaking a toxic substance. The document asks readers to make observations and inferences about pictures.

1. Observation vs. Inference Starring Homer J. Simpson

2. Observation Observation: when studying something describe only facts that you can see, touch, smell and hear. You are not making any guesses. THIS IS NOT AN OPINION!! Ohh… This liquid is green and it is leaking from a brown can. I also smell it.

3. Inference Inference: using your observations to make a guess about an object or an outcome THIS CAN BE A SCIENTIFIC OPINION Based on my observations , I think that this can is old and is leaking a toxic substance.