Oh, I did this! I forgot that I promised to come back on here and post that. I did it about 10 days ago, and it was pretty fun. (I'm a mom, but they've now hit their quota of moms.) You get $40.

I'm not supposed to say much about it so that I don't influence anyone else's results. But it's pretty easy, pretty interesting, and involves virtual reality.

how much compensation?

Are you the father of a 4-7 year old child? If so, you may be able to participate in our New Technology and Child Health (N TECH) study. Participants will fill out an online survey and make one visit to the National Institutes of Health in Bethesda, Maryland. The NIH is Metro accessible. Compensation is provided and no medical procedures are done. Your child will not need to participate. Please call 301-451-1268 or email ntech.study@gmail.com. Please provide a phone number where you can be reached. For more information about the study, please visit https://clinicaltrials.gov/ct2/show/NCT02622035?term=new+technology+and+child+health&rank=1.