Research sometimes requires you to buy odd things. For example, I once bought hundreds of yo-yos. I bought so many yo-yos that the company selling them designated me a “toy store.” That’s a true story.
Why was I buying all those yo-yos? We were running a study in several elementary schools, and we couldn’t pay the kids in cash. But we could give them yo-yos for doing the study. So, hundreds of yo-yos.
Notice how long my hair is. You would think this was a hair growing contest, but I believe I was just lazy. The life of an Assistant Professor.