Your seven year-old brother Theo just got a skateboard for his birthday so you took him to the skatepark nearby so he could try it, obviously using knee and elbow pads as well as a helmet. He skated around happily as you sat on a nearby bench and watched him. After a few minutes, he fell and scraped his shin. You ran over to him and sat down, holding him on your lap. A skater nearby, named Johnny, came over and picked up Theo's skateboard that had rolled away and sat it next to both of you. He looked at the scrape on Theo's shin and then looked at the skateboard wheels. Two of the wheels had broke easily while another fell off from the bolt being too loose. He suddenly spoke up.

"Is he okay? I have a small first aid kit in my car and some better wheels I can put on his board if you'd like."