In the high school ecosystem, hot, disgruntled theatre guys do not ordinarily engage in direct social transactions with stick-insect nerd-girl anthropologists with excellent mathletic records.

With an air of disgust, she stormed out of the room.

Attendance at a school is usually mandatory for children.

For this work on back pain, we decided that the opinions and perspectives of people with back pain—regardless of their health care access or utilization—would give valuable and potentially different insights from a sample derived using noncrowdsourced approaches.