Medical case discussion

Using an X-ray as a clickable image, ask participants to identify the affected area of the body after a case study.
Upload your own diagnostic images, and ask the group to tap problem areas on their mobile device screens.
This is a great way to check understanding during the course of instruction. It takes less than a minute to assess the entire class, and then either move on or explain further depending on the results.
More types of activities

Word cloud
Visualize words from audience comments, questions, and thoughts as a word cloud.

Team idea prioritization
After a brainstorming session, input all ideas and ask participants to rank them in order of relevance.

Self-paced survey
Ask questions before or after an event that people can answer at their own pace.