Variable A quantity that has the potential to change, e.g. weight, temperature, concentration.

Model A simplified picture of what's physically going on.

Prediction/Hypothesis A specific testable statement, based on a theory, about what will happen in a test situation.

Peer Review Where a scientific report is sent out to peers (other scientists) who examine the data and results, and if they think that the conclusion is reasonable it's published.

Prediction/Hypothesis A specific testable statement, based on a theory, about what will happen in a test situation

Precise Result A result that is really close to the mean.

Random Error A difference in measurement caused by an unpredictable factor, e.g. human error.

Repeatable Result A Result that can be repeated by the same person using the same method and equipment.

Reproducible Result A result that can be consistently reproduced in an independent experiment.

Valid Conclusion A conclusion that answers the original question.

Accurate Result A result that is really close to the true answer.

Variable A quantity that has the potential to change, e.g. weight, temperature, concentration.

Independent Variable The variable you change in an experiment.

Dependent Variable The variable you measure in an experiment.

Control Group A group in a study that is treated in exactly the same way as the experimental group, apart from the factor you're investigating.

Placebo A dummy pill or injection that looks exactly like the real drug, but doesn't contain the drug.

Sample size The number of samples in the investigation, e.g. the number of people in a drug trial

Lincoln did more than any other man to put the stamp of righteousness, to put the stamp of compassion, on the name of America.

Talent and effort, combined with our various backgrounds and life experiences, has always been the lifeblood of our singular American genius.

When I first started getting into the business, a young woman in a music game that was mostly men, I did feel inadequate.

I said, look, do you think you could bring Gerry through, and they said yeah, absolutely, they thought that. Joel was very keen to cast him. If all my music team were happy, I was happy.

That is my wish, hope, instruction for all of you: Take your education seriously, okay? Always do that. Because I wouldn't be here today if it weren't for my education.

It is very reasonable to worry about the harm done by organized religion, and to prefer looser and more private arrangements.

America allows us to be able to dream, then gives us the ability to achieve those dreams.

As you grow and mature, you will want and will earn more freedom to live your lives your way and to make your own choices. This you should do.

In general, I think very few people have a sustained interest in news.

Don't Settle for Mediocrity. Strive for Excellence.

He is blind indeed who does not see, in the signs of the times, a strong tendency to plunge the Union as deep in debt as are many of the States, and to subjugate the whole to the paper system.

Answering questions is a major part of sex education. Two rules cover the ground. First, always give a truthful answer to a question; secondly, regard sex knowledge as exactly like any other knowledge.

I love my sci-fi. I love my fantasy. Yeah! I can say it. I'm a geek. I'm a geek and I'm a proud geek!

Words without thoughts never to heaven go.

A nation has the capacity to choose its own capital city, and Jerusalem is Israel's capital.

There is only one principle of war and that's this. Hit the other fellow, as quickly as you can, as hard as you can, where it hurts him most, when he ain't lookin'.

If I was born 400 years ago instead of now, I wouldn't have the life I have. There were freak shows, and there was horrible discrimination.

Do you know what would hold me together on a battlefield? The sense that I was perpetuating the language in which Keats and the rest of them wrote!

If they are truly nonviolent, they must also realize that civil disobedience is an impossibility till the preliminary work of construction is done.

My face and my body are my product.

Let us also reflect on the honorable service of our men and women of the U.S. Armed Forces currently serving our country overseas in Iraq and Afghanistan, and around the world.

You cannot train alone and expect to run a fast time. There is a formula: 100% of me is nothing compared to 1% of the whole team. And that’s teamwork. That’s what I value.

Comedy is defiance. It's a snort of contempt in the face of fear and anxiety. And it's the laughter that allows hope to creep back on the inhale.

When I die I want to go peacefully like my grandfather didin his sleep. Not yelling and screaming like the passengers in his car.