Science Questions

Science questions are a fun and interesting way to learn about planet Earth, organisms and the universe. In this section you'll find an incredible collection of science questions covering a wide variety of topics.


I have been smoking for 50 years and have always wondered why cigarettes have filter tips. I can remember when none of the cigarettes on the market had filters, and now nearly all of them do. Does the filter do anything?

My glasses have an anti-reflective coating. How does that work?

Crayola crayons have nurtured childhood creativity and remained safely edible for over 100 years. Now learn their story- how they originated in the 19th century, how they've changed, and we'll even tell you how old that familiar label is.

The lead in a pencil is not actually lead. It is a mixture of graphite and clay, but have you ever wondered how they get the lead inside a wooden pencil. Find out how pencils are constructed in this article from HowStuffWorks.

Although technology is helping to make the world seem a lot smaller, there are still major differences between countries. Learn about electrical standardization around the globe.

How do trick birthday candles work -- the kind that re-light themselves after you blow them out?

How can my glasses change from transparent, when I'm inside, to dark when I go outdoors?

You can find glow-in-the-dark item everywhere these days. Have you ever wondered how these items produce their light? Find out the answer to that question in this article.

There is a can of Pam in my kitchen that has a small hole in the lid. Lots of other cans have this hole. Why?

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?

It certainly doesn’t bubble up at the drugstore, and it’s kind of a snooze if you pour it on skin that doesn’t have a cut on it. So, what is it about blood that makes hydrogen peroxide start foaming at the mouth?

Yesterday you talked about hydrogen peroxide, and the day before you talked about Pop Rocks candy. Since we are talking about things that fizz, what about Alka Seltzer? How does it work and why does it fizz?

Many of the things I buy contain little packets of crystals. Some of them actually say "Silica Gel" on them, but many are unlabeled or say something like, "Do not eat." I have found these packets in electronics, vitamins and even in some pepperoni I

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?

I saw your question on fog machines and dry ice and would like to know more -- how exactly does dry ice work?

How do scratch-and-sniff stickers work? What makes them last for years and years?

I'm having T-shirts printed, and the people at the shop keep talking about "silk-screening." How does silk-screening work?

A nautical mile is used for navigation at sea. It is a unit of measurement that is based on the circumference of the Earth. How does it relate to a standard mile and a kilometer? Find out in this article.