During the past couple years this pulsar has been unusually active. Timing the arrival of its pulses shows the effects of rotational energy loss which is result of magnetic dipole radiation and currents. Superimposed on this slowdown are sudden events, glitches, which result from sudden changes of the internal structure. In the past two years a swarm of glitches have been detected with our pulsar monitoring telescope in Green Bank, WV. Unrelated to the glitches is activity in the effects on signal propagation incurred as it passes through the filamentary network of thermal plasma that surrounds the relativistic bubble of plasma in the Crab Nebula, dispersion and scattering. Finally I will describe investigations of giant radio pulses emitted by the pulsar that are aimed at exploring properties of the emission mechanism.