led to the discussion and treatment of sexual problems. Many of Sigmund Freud's ideas are no longer used today, but no one disputes his great influence on the science of mental health.

Our final scientist of the past 1,000 years is Albert Einstein. He changed the way we understand the universe. The great scientist was born in Germany in 1879. In 1905, Albert Einstein published one of the most important scientific documents in history. It explained his special theory of relativity. This theory is about the ideas we use to describe natural events. It is about time, space, mass, movement and gravity. Albert Einstein is perhaps best known for his mathematical statement E=MC2 or energy equals mass times the speed of light squared. This statement explained that a great amount of energy could come from a small piece of matter. It explained how the sun could give off heat and light for millions of years. It also led to the discovery of atomic energy. Albert Einstein's theories, like those of the other great scientists of the millennium changed our world.

Part IV

Control, sort, on the page, working out, a whole section, fail,

in a position, repeat,

Vocabulary, stop, its context, barrier, miss, lost,

Determination, go, rephrase, a half-missed point, the gap, purpose, key words, main points,

ahead of, incompleteness