How long does it take sunlight to reach the Earth?

Here's a question… how long does it take sunlight to reach Earth? This sounds like a strange question, but think about it. Sunlight travels at the speed of light. Photons emitted from the surface of the Sun need to travel ...

What is Hooke's Law?

The spring is a marvel of human engineering and creativity. For one, it comes in so many varieties—the compression spring, the extension spring, the torsion spring, the coil spring, etc.—all of which serve different and ...

Gene discovered in Georgia water a possible global threat

A gene that causes bacteria to be resistant to one of the world's most important antibiotics, colistin, has been detected in sewer water in Georgia. The presence of the MCR-9 gene is a major concern for public health because ...

Transparent aluminium is 'new state of matter'

(PhysOrg.com) -- Oxford scientists have created a transparent form of aluminium by bombarding the metal with the world’s most powerful soft X-ray laser. 'Transparent aluminium' previously only existed in science fiction, ...

How many planets are in the solar system?

I'm just going to warn you, this is a controversial topic. Some people get pretty grumpy when you ask: how many planets are in the Solar System? Is it eight, ten, or more?

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