1/24/11 Can Cell Phones Damage Your Brain?

Going into this article, I already knew what it was about. I had heard of this many times before and never believed it. And now, according to this article and its authors, I have reason to not believe it. When you use a cell phone, your skin is only heated by a fraction of a degree, less than a sun's ray. Also, microwaves from cell phones only give out 1/15,000,000 of the energy of X-Rays. The waves from cell phones are even weaker than waves from a microwave oven. Personally, I believe that to fry your brain with a cell phone, you would have to tape three continuously running cell phones to your head for a very long time. And i do mean a very long time I do not believe it is easily possible to fry your brain with a cell phone and this article can back that up.

I tend to agree with you. You are probably at much higher risk from sunburn than from cell phones. Good Job! 5 stars. MW

2/25/11 Motion Detectors

What I thought was interesting about this article was the different ways that motion can be detected using Infra-red light and even sound. Some motion detectors use a light that makes a sound when it is disrupted, some use echoes, and others use warmth from living beings. Another interesting thing was that Einstein did not win the Nobel prize in physics for the theory of relativity and E=mc^2, but instead for his research on the photoelectric effect. One last thing I thought was interesting was that the eye is sort of a photo sensor. Visible light pushes electrons around to create chain reactions which culminate into a nerve impulse that gets sent to the brain to tell it what you are seeing.

Looks good! You found some very interesting things! 5 stars! MW

2/28/11 Redefining The Kilogram (LATE)

This article is about the standard kilogram and how it is the last of the SI base units still represented by a physical artifact. It is soon to be replaced. One thing I thought was interesting about this article was how protected this golf-ball sized chunk of metal is. It is kept in a case in a vault along with 6 other copies of it at the International Bureau of Weights and Measures near Paris, France. Another interesting thing is that the standard kilogram has lost weight and must be replaced. It has lost about 50ug (micrograms, 50/1,000,000 of gram) over time. One more thing I thought was interesting about this article was that the kilogram is the last SI base unit that is still represented by a physical artifact.

You sort of repeated yourself on the "last artifact" idea. Overall a decent post - although a bit late coming - 3 stars. MW