I have had the pleasure of working with Professor Rodolfo Romañach at the University of Puerto Rico Mayaguez. I have learned many things from him and those who work in his lab.
His favorite explanation of this research is that variation implies information. Professor Romañach told me that if I left the house when my mom was happy and I came back and she was mad, there is important information to be learned from the variation of her mood.
If I know that the variation of her mood was from leaving my room messy, then in the future I can keep my room clean and keep my mom happy. This research looked for variation in NIR spectroscopy so that we can find ways to address them.