Human: What's an argument for and against wearing a helmet when riding a bike? Assistant: 
Argument For: Wearing a helmet while riding a bicycle can help reduce the risk of head injuries. Helmets also protect your hair, ears, and neck from damage caused by debris kicked up from the road or other cyclists.2 Argument Against: Helmets are not always worn correctly, which can increase the risk of head injury. Additionally, helmets can be uncomfortable to wear and cause sweating.