 Oh I'm talking about about 40 years of learning about ACL and working with many other scientists over the year and all and put to me all the way you know through Dr. Hewitt and other people and I think that there should be a balance between biomechanics and biological. I think both play an important role. If you don't have the right biomechanics, all the biological enhancement is going to fail. So if you put too much biological in it may be too much of a good thing too. I essentially still look at clinical results of ACL. I still write papers on biological and biomechanics. The first summit is I think the first time they did it so a lot of excitement, a lot of people, but now I think they settled down. I think Dr. Hewitt can pick you know many of the you know I would say hot topic my agent for example is a hot topic so I think it's good that he focus on a few things. I think the idea is to benefit the patient so I think that we have to pick the right thing for the patient to do and train the next generation of surgeons and scientists to think broadly and also capture the essence of our patient care.