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How do spray bottles pump fluid?

home.howstuffworks.com/question673.htm

How do spray bottles (like the ones used for cleaning products) pump fluid? Why do you have to pump them a couple of times before they start spraying?

Why are the insides of tunnels usually covered in ceramic tile?

science.howstuffworks.com/engineering/civil/question674.htm

I've noticed that the insides of road and subway tunnels are usually covered in ceramic tile. Is there any particular reason for this or is it simply convention?

Can I get struck by lightning when I'm indoors?

science.howstuffworks.com/nature/climate-weather/storms/question681.htm

You've heard the warnings about thunderstorms: Stay out of the tub, unplug your TV and don't call people from your land line. But can you really get struck by lightning while you're inside?

What is virtual memory?

computer.howstuffworks.com/question684.htm

I keep hearing about "virtual memory" in computers. What is that? How can memory be "virtual"?

What Does 2.4 Liter Mean in the Context of an Engine?

auto.howstuffworks.com/question685.htm

This may sound silly, but on the back of my car there is a little sign that says "2.4 liter," and every morning I see that and wonder "What does that mean?" So what does it mean?

Why can some medicines be taken as pills, while other medicines have to be injected with a needle?

health.howstuffworks.com/medicine/medication/question686.htm

Medicine administration can be done in pill form, or through injection. Learn about some of the different types of medicine administration methods.

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