This simulation is inspired by this great article.

Other resources with great simulations: article 1, article 2, and tool.

Educational videos about the virus spreading: video 1, video 2, video 3, video 4, video 5, video 6, and video 7.

Stay home during a pandemic, because the social distancing is the most powerful medication.

Note: This simple simulation isn't a 100% real-world simulation, because there are many more factors in the real world and the people aren't just balls that are bouncing.