When does a significant p-value indicate a true effect?
Understanding the Positive Predictive Value (PPV) of a p-value
This blog post gives an introduction to the app.
This app is based on Ioannidis, J. P. A. (2005). Why most published research findings are false. PLoS Medicine, 2(8), e124. http://doi.org/10.1371/journal.pmed.0020124