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

Let us then be up and doing, with a heart for any fate; still achieving, still pursuing. Learn to labor and to wait.

I will interview bigwigs if I get the chance, but you are seldom surprised by people in power - you've got to get awfully damn close to get anything new.

Nothing that comes easy is worth a dime.

I love 'Maxim,' actually. It's very cool.

I am a happy person and I choose to be a positive person. I think some people think my life has been tragic and there have been these horrible dramas but things really have been, and are, fine.

Barack Obama could solve this problem and get the birthers to back off... by showing his long form birth certificate.

I am shocked at how much time I spend in the White House. I mean, you know, for people on the outside, the idea of going to the White House for a meeting must seem like the most important, serious, even glamorous kind of thing to do.

The forthputting of willpower is a means of strengthening willpower. The will becomes strong by exercise. To stick to a thing till you are master is a test of intellectual discipline and power.

Politicians are the same all over. They promise to build bridges even when there are no rivers.

I'm actually writing history. It isn't what you'd call big history. I don't write about presidents and generals... I write about the man who was ranching, the man who was mining, the man who was opening up the country.

I'm really interested in having a studio one day and being a filmmaker.

I don't consider myself a celebrity, and I don't consider myself a star.

Everyone at school knew who my dad was. It made me a little self-conscious a little introverted because I had a lot of attention drawn towards me, but in a way I guess it gives you a little bit of a celebrity skin, even though I wasn't a celebrity.

Alan Cumming is such an amazing performer and person.

In the U.S., the incidence of diabetes has increased proportionately with the per capita consumption of sugar.

Cuba has become a symbol of courageous resistance to attack. Since 1959, Cuba has been under attack from the hemispheric superpower.

What is ugly about life is that it so often only provides uneasy half solutions that are so seldom pure and tragic ones.

When I was a kid in the U.S., 'Doctor Who' wasn't really on, but you would occasionally catch an episode. Different stations did marathons.

I'm always inspired to write, and it's usually my own life experiences that inspire me.

Some things is made by destiny, yes, other things by hard work, but quality you don't learn. Quality you are born with.

I have learned now that while those who speak about ones miseries usually hurt those who keep silence hurt more.

I just feel like every kid is growing up too fast and they're seeing too much. Everything is about sex, and that's fine for me. I'm not saying I don't like it. But I don't think it should be everywhere, where kids are exposed to everything sexual. Because they have to have some innocence; there's just no innocence left.

Following the path of least resistence is what makes both men and rivers crooked.

I'm no spring chicken. The same arthritis that ate up my left hip that finally got replaced hasn't stopped there... And touring is a lot of work. I'm impressed when I see people like Eric Clapton out there. Gee whiz, Eric, give me a break! I know it's gotta hurt somewhere.