Sturgell,+Kira

**2/7/11**
 * Post 1**
 * Airline Security**

This article shows density in everyday life. With growing terrorist threats, security is making major technological advances in airports. I thought it was interesting to see how the machine made the explosives show red, and stand out against the rest of the picture. There are so many new and different forms of security in airports. I wonder how airports decide which types to use. Some of these forms of security even seem a bit invasive. It makes you wonder where they'll end up drawing the line. Kira, OK. Looks good! 5 stars. MW **Post 2** **2/9/11** **Redefining the Kilogram** I thought the choices of the seven base units of the International System of Units was pretty interesting. A lot of them don't seem like measurements people use a lot in every day life. I wonder who decided which base units to include. I also wonder if they will ever add more. It surprised me that they keep the official kilogram locked up in the vault. It's kind of funny that after all that ( trying to keep it safe/ locked up) it lost weight. I was also surprised that they don't have more exact copies. Six copies doesn't seem like very much at all. Kira, OK. I guess they figured 6 copies were enough. I think they will be museum pieces after they redefine the kg. The SI units are common in the scientific community but you are right we don't run across them very often in everyday life. Good post 5 stars. MW

I was surprised to see how many ways motion detectors can be seen (or should I say //not// seen) all around us. I mean typically when I think of a motion detector, I imagine a bank with a bunch of red lasers going all different directions, and some person with a ski mask on. But the article shows how motion detectors are used all over, like when you walk into a store, or open your garage. I also didn't realize that there were three different methods used by motion detecting devices. Reading this article reminded me of a scene in "Get Smart" when the agent uses smoke so they can see the motion detecting lasers all over the hall. I wonder if there will be a lot more technological advances regarding motion detectors in the near future, or if the advancements have reached somewhat of a plateu.
 * Post 3**
 * 3/3/11**
 * Motion Detectors**

Kira, OK. Actually the "laser" motion detectors are fictional. They generally work with invisible "light" not lasers. 5 stars. MW