The Harvard team has exploited such dogged persistence by genetically engineering stem cells to make them produce a protein called cytosine deaminase.

ECONOMIST: Cancer treatment

Without his dogged persistence, the Geneva summit might never have taken place and would certainly have ended four days (and sleepless nights) earlier.

ECONOMIST: Trade talks

And I tell that story partly because it brings a smile to my face, but also because it captures the quiet, dogged, dignified persistence that all of us who loved Dr. Height came to know so well -- an attribute that we understand she learned early on.

WHITEHOUSE: Remembering Dr. Dorothy Height