Select two terms that are examples of how language changes over time.
Glitch, Megabyte, iPod, Dude, You Tube, Web cast, Space station, Blue jeans, Text, Cool, Like, CNN, Global warming, Cola, Interface, Reality TV, Podcast, Blackberry, Cowboy, MRE, Humvee, GI, Dollar, Streaming video, Rock ‘n Roll
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Languages are not static commodities - the meanings of words and phrases change and evolve over time. English is certainly no exception to this pattern.
Consider the word "like." "Like" in its historic meanings could have been used as a verb indicating affection or approval for something, as a noun indicating one's preference for something, or as an adjective to indicate that one thing was similar to something else. In contemporary English, "like" is used as an indication of similarity, disgust or dismissal, or as a stop-gap placeholder in a conversation while the speaker thinks of what to say next.
In the same way, the word "cool" originally was an adjective that meant somewhat cold; in another use, it could mean somewhat detached or aloof. It could also describe an approach to jazz music or a specific range of color tones. In contemporary English, the most common meaning of "cool" would be to indicate approval of sonething or someone.