Fast Internet connections are all the rage, mostly over DSL and cable modems. But a little-known competitor - a technology that promises speeds up to 200 megabits per second over existing electrical infrastructure - is jostling for a place in this lucrative market.

I have heard that at 16 years old, Albert Einstein constantly wondered what it would be like to ride on a beam of light. Students in physics always seem to be fascinated by the properties of light. However, speed-of-light demonstrations often require extensive preparation or expensive equipment. I have prepared a simple classroom demonstration that the students can also use as a take-home lab.

It is extremely important to know what search engines don't want. Otherwise, your perfectly optimized site can be blacklisted or not indexed. This is a high price to pay, considering that search engines account for 85% of new visitors to some sites. Therefore, when you learn about factors that influence search engine rankings, you should also learn what to avoid.

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