"Weak measurement" is a natural extension of a pragmatic view of what it means to measure something about
a quantum system, yet leads to some rather surprising results. I will describe a few examples of our recent
experiments using weak measurement to probe fundamental issues in quantum mechanics such as what the
minimum disturbance due to a quantum measurement is. I will also argue that there are regimes in which weak
measurement offers a practical advantage for sensitive measurements. Time permitting, I will also say a few
words about our recent experiment studying the onset of the effective mass in an optical lattice.