The early registration discounts for this year's NEURON summer courses were supposed to end on Monday, April 20, but we have been able to arrange to continue them until Friday, May 15. NEURON Fundamentals June 20-23 addresses all aspects of using NEURON to model individual neurons, and also introduces parallel simulation and the fundamentals of modeling networks. Includes a healthy serving of Python. Parallel Simulation with NEURON June 24-26 is for users who are already familiar with NEURON and need to create models that will run on parallel hardware. Pays special attention to powerful strategies and idioms for implementing and managing models, measuring and improving performance, and debugging. Each day includes a block of time for working on your own code with expert help close at hand. For more information, including course fees and the registration form, see http://www.neuron.yale.edu/neuron/static/courses/nscsd2015/nscsd2015.html --Ted