Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

What advances have been made in medical physics?

 There have been many advances in medical physics in recent years. Some examples include the development of new imaging technologies, such as magnetic resonance imaging (MRI) and computed tomography (CT) scans, which allow doctors to create detailed images of the inside of the body. These technologies have greatly improved the ability to diagnose and treat a wide range of medical conditions. In addition, there have been significant advances in the use of radiation therapy to treat cancer, including the development of more precise ways to target tumor cells while sparing healthy tissue. There have also been advances in the use of medical physics to improve surgical procedures, such as the use of lasers and other precise instruments to perform minimally invasive surgeries.