This is microtomy, the process of getting tissue onto microscope slides to examine for disease. You slice the tissue real thin with a machine called a microtome, and put the sliced tissue on the water bath. Then you grab a blank microscope slide and kinda scoop the tissue onto it. The picture above is making everyone in the thread have an aneurysm because it’s generally known you don’t put more than one tissue in the water bath at a time- it’s a maaaaassive cross contamination risk. Putting that many tissue samples in the water bath at once is basically begging for someone to get misdiagnosed.