Is it art or science? We'd say both. This microscopic image shows the cells that line the small intestine. They are constantly exposed to harmful substances that pass through the intestine, which can cause DNA mutations. So it's a good thing that the majority of the intestinal lining is replaced every 3 to 5 days. In the meantime though, there is a continuous competition between healthy cells and mutated cells, which can become cancer cells. Luckily, healthy cells usually come out on top. These cells get even better at winning this battle when the amount of calories in a mouse's diet is roughly halved, researchers of the Netherlands Cancer Institute discovered. They recently published their findings in the scientific journal Cell Reports. Read the scientific paper here.