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[00:00.44] Green is an important color in nature.

[00:06.02] It is the color of grass and the leaves on trees.

[00:11.06] It is also the color of most growing plants.

[00:16.91] Sometimes, the word green means young, fresh and growing.

[00:24.89] Sometimes, it describes something that is not yet ripe or finished.

[00:32.59] For example, a greenhorn is someone who has no experience, who is new to a situation.

[00:43.75] In the fifteenth century, a greenhorn was a young cow or ox whose horns had not yet developed.

[00:54.37] A century or so later, a greenhorn was a soldier who had not yet had any experience in battle.

[01:04.73] By the eighteenth century, a greenhorn had the meaning it has today - a person who is new in a job.

[01:15.63] About one hundred years ago, greenhorn was a popular expression in the American west.

[01:24.39] Old-timers used it to describe a man who had just arrived from one of the big cities back east.

[01:34.22] The greenhorn lacked the skills he would need to live in the hard, rough country.

[01:42.98] Someone who has the ability to grow plants well is said to have a green thumb. The expression comes from the early 1900s.

[01:57.33] A person with a green thumb seems to have a magic touch that makes plants grow quickly and well.

[02:07.15] You might say that the woman next door has a green thumb if her garden continues to grow long after your plants have died.

[02:19.38] The Green Revolution is the name given some years ago to the development of new kinds of rice and other grains.

[02:30.27] The new plants produced much larger crops.

[02:34.78] The Green Revolution was the result of hard work by agricultural scientists who had green thumbs.

[02:45.14] Green is also the color used to describe the powerful emotion, jealousy.

[02:53.37] The green-eyed monster is not a frightening creature from outer space.

[02:58.96] It is an expression used about four hundred years ago by British writer William Shakespeare in his play "Othello."

[03:10.38] It describes the unpleasant feeling a person has when someone has something he wants.

[03:20.22] A young man may suffer from the green-eyed monster if his girlfriend begins going out with someone else.

[03:29.52] Or, that green-eyed monster may affect your friend if you get a pay raise and she does not.

[03:39.61] In most places in the world, a green light is a sign to move ahead.

[03:47.05] A green light on a traffic signal means your car can continue on.

[03:53.15] In everyday speech, a green light means approval to continue with a project.

[04:00.59] We want you to know we have a green light to continue this series next week.