TODO Let people healing with a probability (decreases exponentially?) over time, similar probability to die and 1-p_die-p_heal to be still sick Simulation details: 2D grid spacexspace representing the space Each cell of the grid can be contaminated or not contaminated. After dt timesteps a cell is contaminated comes back to be not contaminated It starts from a population of npeople people with one ninfected. People are moving through random walks (dispacement defines the size of the motion) If an infected person passes through a not contaminated cell the cell becomes contaminated, if it's already contaminated the timer of the contamination start over If a person not infected passes through a contaminated cell has a probability of p_get_infected to get infected After lifetime timesteps a person is infected is deleted from the list of people (and from the grid)