 Sure. So, you know, I always like to make the point that retirement is the most expensive purchase you're ever going to make, right? As much as your fancy new iPhone, your nice new car, your fancy home costs, retirement is over a million dollars. So it really makes sense to think about the assumptions that we use to figure out the cost of retirement. And so with that research, I actually used a data set called the Health and Retirement Study that tracks individuals throughout retirement, so over time.