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Gareth Cook asks

How do "security tags" in shops work? I'm referring to the white plastic, bar-coded tags containing...

David from the Internet asks

Where did the constant pi (3.14159...) come from? Who discovered it and when?

Linda Horsman from Gibsons, BC asks

What is the cause of static electricity? Also, I'm doing research for a book and I wanted to know...

Chanell from South Africa asks

Why do some people bruise more easily than others? What is it that makes some people more sensitive...

Willi Luke asks

I am currently doing research on the e-bow, a guitar effect that calls upon an infinite feedback...

Sara J Shaw from Northwood, NH asks

I have aplastic anemia, and from what I understand, my T-cells are destroying the stem cells from...

Jeff Owens from Seattle WA USA asks

I have an interest in algebraic manipulation of known physical/chemical laws & principles. I am...

Suzanne Hamricks asks

I gave a child up for adoption in 1966. I have found someone who might be my child. She has type...

Gary Edwards from Carleton Place, Ontario, Canada asks

Why do carrots spark when cooked in a microwave? Peel 1/2 a carrot, dice it into small pieces, put...

Kim from london asks

When making a mixture of solvents up to a particular volume eg. 2L of 25% methanol 75% DMSO. My...

Barbara Lynn Terry from Milwaukee asks

I understand that there is a hormone in the brain that regulates and controls sexuality. Is this...

Leo Molenaar asks

Is the up and down movement of a piston in a combustion engine a waste of impulse energy? The...

Sue Smith from Salem, Oregon, USA asks

I am wondering about the difference between wood bats and aluminum alloy bats; I need a simple way...

Ian Rosner asks

Can you explain the fourth dimension and state simply Einstein's Theory of Relativity?

Sarah from the Internet asks

Why doesn't pepsin break down gelatin on developed photographic film or does it just take a very...

Gary A. Ballan asks

I know that there has been success with crossbreeding horses with zebras, dogs with wolves and...

Beth Conrad from Hong Kong asks

How can I build a water purifier?

Curious_Boy from the Internet asks

How do fronts affect temperature? Do pressure centres affect temperature as well? I know that they...

Selena Henderson from Houston asks

Why don't hurricanes hit the country of Panama? Is there any data predicting the probability of...

Mohammad from Toronto asks

What is 2 with the power of 4? and can u tell me some consideration of microwaves?

Jenn from Torrance asks

What is the composition of an American nickel? Also, do you think that a nickel has a higher...

Robert asks

What is more efficient: to push or pull a car (front wheel vs. rear wheel drive)?

Sandi Schacher asks

How do cells know when to stop growing (dividing)? How does cancer change the cell so that it no...

Jonathan Weiler asks

How are the tiny chips and wires that go into a computer made? They seem so tiny and fragile.

Anonymous asks

How does light therapy work for people with SAD (Seasonal Affective Disorder)?

Sheila Hart asks

How can you detect a chemical in the human body even after it has passed through? For example,...

Peter Schmuecking from Roetgen nr Aachen/Germany asks

My son, 13 y, has found a really good idea to prove the four colour map problem without computers,...

Yuriy Yashkir asks

What does the future of Psychology hold? New therapies for brain disorders? Computer...

Jackie B. from Wisconsin asks

Which metal conducts heat the fastest?

Jefrey from KL asks

What is the purpose of polyvinylpyrrolidone in the making of hard capsule gelatin. What is the...

Jeremy from Norwood asks

What component controls how data is written on a hard drive?

Kaycie Nabeta asks

Does the location of chlorophyll a in the thylakoid membrane have anything to do with its...

Ken Cooke asks

I read somewhere there are a total of 9 dimensions. Can you elaborate on what these dimensions are?...

James Hope from Gloucester asks

Last year in school we learned about nuclear decay, and how some atoms decay by releasing gamma...

Emma from the Internet asks

Why has Aluminium only recently been extracted from its ore?

Eric Chan asks

I am considering an idea to measure the effects of ozone depletion. I intend to use an ozone making...

Adam Moore from Denver, Colorado asks

I am in the 6th grade in Denver, Colorado. I made a machine out of 2 by 4s that will kick a ball. ...

Anonymous asks

How can I create a real light saber? It does not have to be completely like the ones in the movie...

Lia Cassanego asks

I am experimenting with microwave reboil caused when you microwave coffee or water and add sugar,...

Steve Appleby asks

What catalysts are needed to break down plastic containers, such as yogurt cups?