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 ...

The leaves of this species 201 million years ago had their net-like veins. They looked at the look old collections with new ...

Leaf blades, sheaths, and ear husks may show symptoms on susceptible hybrids. Early symptoms appear as long, narrow tan lesions running parallel to the leaf veins. As the disease develops, these ...