In the fourth episode, Modesto Orozco and I talk about the rough path to the predictive power modern computational science has achieved in biology, and the immense possibilities it opens to today's computational biologists working across the scales of space and time. Modesto also reflects on why sharing simulation data is crucial to make sure that our results are trustworthy, and how access to other people's simulations can become a gold mine in the data-driven era of computer modeling.