Frey,+Sarah

1/24/11

Topic: Mineral Makeup

I chose this article because I wanted to learn more about what kinds of substances help create mineral makeup and how it is different from regular makeup. Mineral makeup is made of large numbers of compounds that are found in nature. There is also no scent or preservatives unlike regular makeup. I found it interesting that talc and mica are used in most mineral makeups. Another reason I chose this article was because there are many makeup companies claiming that they use natural products from the best plants best. I gained lots of information about what makes up makeup and why it is so popular.

Sarah, Nice! Well written post. Glad you found some interesting things! 5 stars. MW

2/8/11

__Redefining the Kilogram__

If found this article interesting because I know now how important the kilogram is. One thing that I found that the kilogram prototype lost 50 µ. I'm still confused to how a kilogram can lose weight.If there was a lab and an object wasn't accurate, then the object wouldn't be used because it is not exactly correct. So far we have used the SI to measure objects so that the outcome will be right. We also use scientific notation, which will be used as the new standard.

Sarah, Well scientific notation is really not a standard, but it is very useful! Overall good job. 5 stars. MW

2/25/11 __Motion Detectors__

Before I read this article, I knew that motion detectors could sense different types of motion, but I didn't know that sound, temperature, and radiation could also be used. This relates to our class because we already have the knowledge of what things are, but we learn what else relates to the subject. I still wonder why infrared lights can sense where we are, but why we can’t see them? I found it interesting that elevator doors rely on beam of light because I always thought that if someone just puts their foot on the door, that would be the only way that the door would know not to close. I have a motion detector at home, which gave me an idea of how the detector functions as I read the article. I never knew that body temperature was involved in motion detection because the weather could be different than a body of a human. Sarah, You would think that a motion detector could be set off accidentally if something warm goes by it. Interesting thoughts. 5 stars. MW