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What are calories? How are they measured in food?

recipes.howstuffworks.com/question670.htm

I read labels on food packages and always see the number of calories listed. What are calories? How are they measured in food?

Do the Digits in My Social Security Number Represent Anything in Particular?

people.howstuffworks.com/question719.htm

Is it just a random number? Moreover, do they recycle Social Security numbers so that if someone dies, that number goes back into action?

Can Cats Eat Dog Food? A Nibble of Kibble Is OK, But...

animals.howstuffworks.com/pets/can-cats-eat-dog-food.htm

If you've caught your cat sneaking a few bites from your dog’s bowl, you may have asked yourself, can cats eat dog food?

Why Is My Cat Sleeping So Much? Do Younger Cats Sleep More?

animals.howstuffworks.com/pets/why-is-my-cat-sleeping-so-much.htm

You glance over, and once again, your cat is napping in the same sunny spot. Naturally, you start to wonder, why is my cat sleeping so much? While it might seem excessive, for most cats, sleeping a lot is completely normal.

Can Cats Cry Tears of Sadness?

animals.howstuffworks.com/pets/can-cats-cry.htm

You hear your cat meowing in the middle of the night and wonder, can cats cry like humans do?

10 Iconic Mountain Ranges in Europe

science.howstuffworks.com/environmental/earth/mountain-ranges-in-europe.htm

Europe is a continent of dramatic elevations and scenic diversity, and the mountain ranges in Europe are a testament to that.

Are Christmas Trees Toxic to Cats? What About Tree Water?

animals.howstuffworks.com/pets/are-christmas-trees-toxic-to-cats.htm

The holiday season brings twinkling lights, festive decorations, and of course, the classic Christmas tree. But if you’re a cat owner, you may be wondering: Are Christmas trees toxic to cats?

9 Arctic Plants That Defy Nature to Bloom Near the North Pole

science.howstuffworks.com/environmental/earth/arctic-plants.htm

The Arctic plants that survive near the North Pole thrive in one of the harshest environments on Earth. Extremely cold temperatures, strong winds, snow, and ice limit tree growth and shape unique plant communities across the Arctic tundra.

How PDAs Work

electronics.howstuffworks.com/gadgets/travel/pda.htm

PDAs give you big-time computing power on the go. Learn about PDA technology, get PDA buying tips, read PDA reviews and compare prices on popular PDA models.

What Are the 17 Symptoms of PTSD?

science.howstuffworks.com/ptsd.htm

Post-traumatic stress disorder was first described by a doctor treating patients during the Civil War. Learn about post-traumatic stress disorder.

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