Who decides what a dual-use item is?

Robert M. Thorson, a Connecticut geologist, has traveled throughout his career to conferences and conventions, and for the last three years, he has taken with him one of his favorite rocks, a banded piece of the Hebron Gneiss, which he describes as resembling "a broken slice of layer cake composed of licorice and cream cheese." This is one of Thorson's favorite rocks, and, he says, a touchstone for those who have attended his lectures.

(Continue reading at MoJo Blog)