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Peter Schmuecking from Roetgen nr Aachen/Germany asks

My son, 13 y, has found a really good idea to prove the four colour map problem without computers,...

Mike Tripple asks

What happens to the ice cubes in our freezer bucket. They get smaller even if they are a solid. Do...

Mohammed Talha Khan asks

Why does water evaporate when it is left out in the open?

Mike Delie from Menomonie asks

I'm doing a senior project on recycling, and I'm curious if it uses more energy to mine and convert...

Shauna from the Internet asks

How long can a vehicle typically run without oil or antifreeze before the engine seizes?

Krystal Cuttell asks

Who was Karl Adolf Clark?

Anonymous from the Internet asks

Why does water not sink down through the ocean floor?

Alain Goulnik asks

Can nuclear tests produce earthquakes? India started nuclear testing, then Pakistan followed in...

Saw Mui asks

Why does the Periodic Table of the Elements have two separate tables - one above and one below?

umit koseoglu from the Internet asks

how would i go about making some dry ice at home or in the school lab?

Kelvin C from Markham, Ontario, Canada, North America asks

I was wondering, what solids or liquids can trap heat in very well, or at least maintain the...

Kim Yonda from Winnipeg, Mb asks

I'm doing a project on mercury in water. I was wondering if and how you get mercury out of lakes. ...

Mike Starry from Fresno, CA asks

How and when will hydrogen fuel cells be used to provide electricity for my home? What would it...

Rick Morrison from Sudbury On asks

What makes certain surfaces such as highway lane markings, reflective strips on clothing and...

Thalia Parcs from Toronto asks

I have noticed in Toronto for the past two years, that the weather has been abnormally cloudy in...

bree kissner from kingsville asks

why does soda pop fizz when it is poured over ice

Tony Sousa asks

How do hot packs work? My wife purchased a reusable hot pack for keeping our baby warm when we go...

Natasha Jackson from leaf river asks

How many skin cells would be in a square inch?

Linda O\'Neill from Dartmouth asks

How can you define the pressure of 5 g. on a person? This would be done with the fingers. I am...

Marcos Chimenti from Rio de Janeiro asks

Does air act as an insulator against lightning on flying airplanes? I know the aluminum case is...

Ian Gordon from Exeter UK asks

Why are sounds so much louder downwind, even when the wind is light?

Ken from Vancouver asks

If one could increase the flow of air into a jet engine,would this increase the efficiency of the...

Karla asks

What causes the bends?

Eduardo from Pembroke Pines asks

Is it true that gas particles at higher altitudes are farther away from each other than at lower...

Raymond J. Sucgang from Manila, Philippines asks

Hi, Could you please clarify: Does an increase in precision mean a decrease in accuracy? Does a...

DeeCee from Indianapolis asks

How does vacuum insulation work and can an R Value be assigned to it? Does the depth of the vacuum...

Dennis Nolivos asks

What is your opinion on the ethics of transplant farming and what is your opinion about genetic...

Kim from the Internet asks

When metal scrapes metal such as two spoons, it makes the edges of my teeth feel numb. Why is that?

Sara asks

Is invisiblilty possible? Is it possible to alter an object so it can't be seen? Could people's...

Laura from Earlton asks

How come on a warm clear day clouds form at night?

Hannah from North Bay, Ontario asks

My Dad told me about bioluminescence you know, the stuff that makes living organisms glow? Anyway,...

Yogesh Patil asks

Can you provide a detailed structure and working of the magnetron tube used in microwave ovens?

Sarah from the Internet asks

Why doesn't pepsin break down gelatin on developed photographic film or does it just take a very...

Phil from Ottawa asks

Are there some materials that shrink faster that other materials in cold? If yes, which ones?

Tony Young from Santiago, Dominican Republic asks

I have a problem with moisture in my apartment. I live in a Caribbean country and am not able to...

Brian from Jersey City asks

How are mountains created?

stephanie from windsor asks

Why can't spruce trees compete with maple trees in more southern forests? What advantages do the...

darioush asks

What is thought? Is it matter or energy? And how does the brain create a thought?

Nikki May from Erie asks

How does heated vinegar react with powdered milk to create the result of plastic like curds?

D. Tolenaar asks

How does air conditioning work?