Conductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.onductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.
Butterhead lettuce. A type of head lettuce whose botanical name is Lactuca sativa var. heirloom. Two common types are Boston and bibb lettuce. Have small, round, loosely formed heads with soft, buttery-textured leaves ranging from pale green on the outer leaves to pale yellow-green on the inner leaves.
The leaves are very attractive, distinctively lobed with the. oak leaf shape. The plant is attractive with fairly tight rosettes of medium. green leaves. Oak leaf lettuce is a type of butter lettuce whose leaves are distinctively lobed. It can be used as. a border accent in a garden and is found in a variety of red and autumn shades. Oak leaf can. also be used as a garnish or can be cooked or stuffed, separated into leaves or served as ma-. ture hearts.