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How do we measure pain?
science.howstuffworks.com/life/inside-the-mind/human-brain/measure-pain.htm
Pain is subjective - what is excruciating to you might be tolerable to me. Which is why it's so difficult to measure and control.
How do you build an underwater tunnel?
science.howstuffworks.com/engineering/structural/build-underwater-tunnel.htm
Underwater tunnels are so commonplace that we rarely think of the great dangers -- and extreme construction techniques -- these modern wonders require. With the opening of the Marmaray Tunnel in October 2013, it's time to take a second look.
How do you measure happiness?
science.howstuffworks.com/life/measure-happiness.htm
Can you measure happiness? See how researchers are trying to figure out how to measure happiness and learn about the Satisfaction with Life Scale.
How do you write the chemical reaction that takes place in a smoke detector?
science.howstuffworks.com/question5.htm
Chemical formulas provide a concise explanation for reactions. In this article, we explain the formula for the reaction in a smoke detector.
How does Pop Rocks candy work?
science.howstuffworks.com/innovation/science-questions/question114.htm
There's a candy called 'Pop Rocks.' When you put it in your mouth it makes a loud popping sound and it feels really weird! How do Pop Rocks work?
How does a Crookes' radiometer work?
science.howstuffworks.com/question239.htm
I once saw this device shaped like a light bulb. It had a vertical support inside it, and on that support there were four vanes with four diamonds on the end. One side of the diamond was black and the other was white. I did a little research and found out that it was called a Crookes' radiometer -- how does it work?
How does a Galileo thermometer work?
science.howstuffworks.com/how-does-a-galileo-thermometer-work.htm
One of my co-workers has an interesting thermometer on his desk. It is a glass tube with different-colored floating things in it. What kind of thermometer is this, and how does it work?
How does a ball point pen work?
science.howstuffworks.com/innovation/science-questions/question683.htm
How does a ball point pen work?
How does a chicken's egg get its shell?
science.howstuffworks.com/innovation/science-questions/question231.htm
How do chickens create eggs? Does the chicken's body make the shell and fill it with the white and yolk somehow, or does it make the white and yolk and then somehow wrap the shell around it?
How does a hydraulic ram pump work?
science.howstuffworks.com/transport/engines-equipment/question318.htm
When I was a kid, my Aunt had constantly flowing water from a natural spring down the hill. She said the water was pumped uphill using a hydraulic ram. This device ran constantly and didn't need any electricity! What is a hydraulic ram and how does it work?