Klinedinst,+Kaycee

I read an article about how cell phones can actually be harmful, by their radiation. Three things I already knew were that my parents are //always// bugging me about being on my cellphone for too long at a time. I also knew they were bad for you, but I never knew why. I also already knew that we use our cellphones close to our brain. I also learned three things. First, I learned that cell phones contain radiation. Next, I learned that cell phone radiation and microwaves are part of the electromagnetic spectrum. Lastly, I learned tat cell phone radiation can lead to things like gama-rays, which can damage the skin cells, leading to skin cancer on a more serious note.

Kaycee, It's always wise to be cautious about "over using" anything but I think you'll find that cell phones use microwaves not gamma rays. 5 stars. MW

Raw Materials Movie 9/19

Something I found interesting was how you can separate materials. I think the distillation way of separating mixtures is very cool, because the water starts as a mixture, then the water comes out fresh and the stuff isn't in there anymore. Also, I think it is interesting how the heat makes water on the side of the bottle, which makes a drop go through the little tube, down and into the beaker. Also, about how the hotter the heat source is, the hydro-carbons are condensed into liquid. I think it is also interesting how you get to see the condensation, and evaporation that is happening. For instance, the water is evaporated into vapor, and then it is turned into a water drop, and filters down the tube. The last thing I found interesting is how so many different materials can come out of a mixture, or solution. You can use the different materials for totally different things.

Kaycee, OK. Good thoughts but that is not water that comes out of crude oil as a colorless liquid. 5 stars. MW

Motion Detectors 10/4

I read the article about motion detectors. I already knew about how they have invisible lasers, and if you touch them, a light can come on. I also knew that these were used for outdoor lights, in grocery stores, and other things too.The last thing I knew was that motion detectors had something to do with electrons and their movement.. One thing I learned was that motion detectors use infrared radiation to detect movement. Another thing I learned was when a light beam is blocked, that's how motion is detected. The last thing I learned about motion detectors was we can only see photo electrons. This means we can't see other kinds of radiation like x-ray, ultraviolet rays, gamma rays, radio waves, and others.

Kaycee, OK. We actually only see photons that carry a certain amount of energy - all electromagnetic radiation is made of photons. 5 stars. MW