Even in California, winter can be a bit of a traumatic season. With the sun going down at 5 P.M. we got a bit of a vampire complex and decided to make February our month dedicated to the viscosity of blood and its derivatives. To go with our mood, we also published an application note on the viscosity of plasma and serum. However, this seemed a bit like decaf coffee to us. If you know the RheoSense crew, we love our coffee! Hence, we wanted to look at the real thing!