In commercial and everyday use, the term weight is usually used to mean mass, and the verb to weigh means to determine the mass of or to have a mass of. Used in this sense, the proper SI unit is the kilogram (kg).
For other uses, see Aphid (disambiguation). Aphids, also known as plant lice and in Britain and the Commonwealth as greenflies, blackflies, or whiteflies (not to be confused with jumping plant lice or true whiteflies), are small sap-sucking insects, and members of the superfamily Aphidoidea.
The charming orb spiders that spin their cartwheel webs in the garden, belong in the family Argiopidae. Among them is a group of pretty colored spiders of the genus Argiope. Each member of the genus has her personal species name. The one we know best is the busy orange and black orb spider.