Kuhn could have illustrated his point with almost anything: for example, the science of plant leaves and their structure. The networks of veins in leaves share universal features that demand ...

For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope with high pressure blood flow and the veins contain valves to prevent the ...

The portal vein is vulnerable to diseases like cirrhosis, which can change the structure of the vessel and reduce the flow of ...