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How do the engines breathe in diesel submarines?

science.howstuffworks.com/transport/engines-equipment/question286.htm

How do the engines breathe in diesel submarines? Don't internal combustion engines need a lot of oxygen to run? Where would all of this oxygen come from when the sub is underwater?

Why are my digital photograph files so huge while photos on other Web sites are much smaller?

computer.howstuffworks.com/question289.htm

How are the picture files on news sites like BBC or CNN so small in size (15 or 20 kilobytes) while the pictures that I scan in with my scanner are so big (like 100 kilobytes or more)?

How do sodium-acetate heat pads work?

home.howstuffworks.com/question290.htm

Heating pads are made of a plastic pouch and a clear liquid. Inside the pouch is a metal disk that when clicked crystallizes the liquid causing it to heat up. Find out how heat pads work.

How can an electric toothbrush recharge its batteries when there are no metal contacts between the toothbrush and the base?

home.howstuffworks.com/question292.htm

I have an electric toothbrush. Somehow, placing the plastic-handled brushing unit into a plastic holder/recharger will recharge the toothbrush unit. If no metal electrical contact is made, how can this recharge the toothbrush?

What is the difference between a fluorescent light and a neon light?

home.howstuffworks.com/question293.htm

Have you ever wondered what the difference is between a fluorescent light and a neon light? We'll explain both technologies in this article.

How do they create the hopping cars you see in the movies?

auto.howstuffworks.com/under-the-hood/trends-innovations/question294.htm

I would really like to know how people can make their cars jump up and down with their front wheels like they do in movies like "Boyz in the Hood."

How do they create the special effects in movies like The Matrix where the camera rotates around a frozen actor?

entertainment.howstuffworks.com/question295.htm

In movies like "The Matrix" and "Lost in Space," and in some TV commercials, there is an effect where the action freezes and the camera "walks around" the frozen scene. How do they do that?

How does an Indiglo watch work?

electronics.howstuffworks.com/gadgets/clocks-watches/question296.htm

When I push a button on my Indiglo watch, the entire face emits a green light. How does that work?

What is the big deal about milk? Why do people treat it like some kind of miracle drink?

recipes.howstuffworks.com/question297.htm

What is the big deal about milk? Why do people treat it like some kind of miracle drink? Learn more about milk in this article.

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