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The Science Behind the Pollen Count

health.howstuffworks.com/diseases-conditions/allergies/outdoor-allergies/science-pollen-count.htm

HowStuffWorks looks at the science behind the pollen count. How do they count those microscopic grains anyway?

Tornado Alley: Where the Worst Twisters Form in the U.S.

science.howstuffworks.com/nature/climate-weather/storms/tornado-alley.htm

Where is tornado alley and why do so many tornadoes form there?

What is St. Elmo's Fire?

science.howstuffworks.com/nature/climate-weather/atmospheric/st-elmo-fire.htm

St. Elmo's Fire is a weather phenomena that often appears on the masts of ships and the wings of airplanes. Learn about St. Elmo's Fire and plama.

Should You Turn Your AC Up When You're Not Home?

home.howstuffworks.com/green-living/should-turn-ac-up.htm

On hot summer days, is it best to turn off the AC when leaving home, turn it up or leave it as is? The answer may surprise you.

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?

Can cracked lips be a sign of dehydration?

health.howstuffworks.com/skin-care/lip-care/health/cracked-lips-sign-of-dehydration.htm

Can cracked lips be a sign of dehydration? Visit HowStuffWorks to learn if cracked lips can be a sign of dehydration.

93% of People Can't Identify These '00s TV Shows From Just One Image. Can You?

play.howstuffworks.com/quiz/93-people-cant-identify-these-00s-tv-shows-just-one-image-can-you-learn

The start of a new millennium brought major changes to television as we know it. The premiere of "Survivor" in 2000 and the glut of reality shows that followed meant that networks had to work harder than ever to make shows that could impress eager TV viewers. Take our quiz to see if you can identify the '00s series by a single picture.

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