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Physics

Corey Conner from Fort Knox asks,

If the sun is a heat source, and as the sun gets closer to the earth the heat intensifies, then why...

the answer

There are a number of factors to consider. First of all, the sun is a...

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Physics

Umit K from Cambridgeshire asks,

How can I construct a simple laser beam?

the answer

Lasers are so cheap, it's easier to buy one for $10 or $20. Here's a summary...

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Earth

John Wrowles from Wellington New Zealand asks,

This question relates to global warming. Recent science news reports that the temperature of the...

the answer

They use something called "climate proxies". Because temperature influences...

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Other

Judy from North York asks,

I understand survival of the fittest, but why would evolution allow animals to live in water but...

the answer

Is your question something like, Would evolution allow animals to live in...

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