Summary:

- This article discusses the concept of "critical mass" in social movements and protests. It explains that the number of people needed to make a protest successful is much lower than commonly assumed.

- The article cites research showing that only around 3.5% of a population needs to actively participate in a protest movement for it to be successful. This is because as more people join, it creates a "social contagion" effect that encourages others to also participate.

- The article suggests that this knowledge can help organizers be more strategic in their approach to mobilizing people for a cause. Even a relatively small group of dedicated individuals can spark larger-scale social change if they are able to reach the critical mass threshold.