Kirkpatrick,+Garret

Motion Detectors

Motion detectors come in many forms. You can have the type of motion detectors that detect using a light source and when the light source is blocked the sensor goes off. Another type of motion detector is the type that uses sensors that monitor the reflection of an echo ad when an object passes through or moves the echo is disrupted and the sensor goes off. The last type of motion detector is warmth or heat, this is when it simply uses an infrared radiation beam coming out and when the beam comes in contact with the human body heat the sensor goes off. The light that is visible lights are the red though violet and the eye of the sensor only can detect these specific lights. I think the different types of sensors are good for different scenarios. Like at a home i have the echo one where if something moves in front and disrupts the sensor it lights up. I think its good we can have all these different sensors because it can keep people out of banks, and houses, and stores. The most effective i would think is the infrared because it is accurate and if anything disrupts it it will go off.

Garret, OK. Looks good! It is difficult to defeat a motion detector. The mythbuster folks tried. 5 stars. MW

Redefining the Kilogram

There are some things in this article tat are pretty interesting. One thing that i found interesting is that the Kilogram is the only weight in the SI system that is still defined by a physical artifact rather than by an unvarying property in nature. This means that all the kilograms are compared to an actual object. Now another thing that i found interesting is that the kilogram actually lost 50µm since it was put into the SI system in france. So this means that it is actually lighter than all of the copies and reproductions for measurements. I also think that it is interesting that they are trying to redefine the kilogram in a very scientific way. It has to do with the speed of light and hv=mc2 and many other scientific things. I honestly could not really understand what was going on with how they are redefining it, but i think it would be good for the SI system to be absolute and set in stone. I think that since the standard kilogram should not be going down in weight because that would make the whole weighing system off.

Garret, Looks good. Having something set in stone is a good thing when measuring. 5 stars. MW

Could Cell Phone Radiation Damage Your Brain?

What the people in this artical are saying is that a cell phone emits a small ammount of radiation. Since people hold a cell phone close to their ear the radiation may seep though their skull and harm their brain. Now there are many different types of radioactive waves, some are harmless and some are very harmful. The ones comming off the cell phones are not that harmful because of the very small ammount. Many studies have been done to see if people who are using cell phones will get brain cancer and such but nothing conculsive has come out of it yet. What they do know is that if a cell phone is hurting peoples brains then it will hurt teens more thatn adults. This is because teen brains are thinner and the skull is not formed completely yet. As of right now we do have laws and rules put in place but people shouldnt worry yet becuase the cell phones are not dangerous enough to hurt them.

Garrett, I think you picked the main points out of this article! 5 stars! MW