Dykeman,+Katherine

I read the article, //Could Cell Phone Radiation Damage Our Brains?// I learned that there have been studies, and still are studies, being done to figure out the answer to this question. I also learned that there are theories that link brain cancer to cell phone usage, but the difficulty of tracking someone’s cell phone usage for ten to twenty years along with the varying ages and weights of humans make these experiment inconclusive. The third thing I learned was that the radiation from cell phones are very different and much less harmful than radiation found in microwaves, so this is nothing to worry about for the time being. Three things I already knew about this topic was that two- thirds of children over seven years old posses a cell phone, cell phone radiation causes less damage to the skin on your ear than the sun, and that X-rays form ions, unlike cell phones that don't have enough energy to create them.

Katherine, Looks good! You picked out the major points of this article. 5 stars. MW

__DISTILLATION__: Today, we watched a video that talked about distillation. Distillation is when you separate different substances in a mixture. The different mixtures boil at different temperatures, so this makes it possible for the different substances to boil out at different times. While watching this video, I learned that you could separate mixtures with more than two substances in the mixture. I found it interesting that industries use the same process (distillation) to separate crude oil, but on a much larger scale.

Katy, Right on! Good job. 5 stars. MW

__MOTION DECTECTORS:__ I read an article on how and why motion dectectors work. One thing I already knew was how motion sensors, like those found in garages, work by have an infared light that if it gets disturbed, it can detect it. Another thing I already knew was that another type of motion dectors works through sensing body heat. A third thing I already knew from the article was the last type of motion sensor work through sound waves and once the waves change the device can recognize it. Three things I learned after reading this article are how a German physicist named Heinrich Hertz discovered how the frequency of different colored beams made the electrons react differently, how different motion detecors have different sensity levels, and how you can try to trick a motion detected sink by figuring out what makes it go off and altering it's sensitivity.

Katie, I experimented with the sink. I don't like the "automatic" towel dispensers because they seem to have to reset themselves and don't dispense very much at one time. Just saying. :) 5 stars. MW