Brown,+Tre

Motion Detectors I found the article about motion detectors to be very interesting. One thing I knew about motion detectors was that they emit a beam of light that can be triggered when someone crosses through the beam. This occurs in most garage doors. Another thing I knew was that waves that have low frequency are red and waves with high frequency are violet. The last thing I knew about motion detectors is that Einstein created the theory of photoelectric effect because we learned about it in class. One thing I learned from the article was that radio waves set off garage door sensors and police gun radars. Another thing I learned is that motion detectors can't detect people through windows if one were to be placed in a building. The final thing I learned is that the eye is a type of photo sensor.

Tre, Looks good - but late. 4 stars. MW

Video post I learned that fractional distillation is used to seperate compounds into different fractions of elements. You can boil the compound until it starts to boil and collect the material that is condensed at the end. Then the temperature is raised and the next substance is boiled and collected through condensation. Distillation helps with seperating substances that can't be filtered out. Distillation is a helpful tool to many scientists.

Tre, Right! Distillation is crucial to our standard of living. 5 stars. MW

The article I read was Could Cell Phone Radiation Damage Our Brains? One thing I knew about this article is that cell phones emit radiation. Another thing I knew is that cell phones don't emit enough radiation to damage your skin. I also knew that the radiation from the sun is more powerful than the radiation that comes from a cell phone. One thing I learned from reading this article is that a limit was set to the amount of radiation a cell phone can give off. Another thing I learned was that people who use cell phones a lot have an increased risk of brain cancer. The final thing I learned was that a wave is characterized by its wavelength and frequency.

Tre, I'm not sure it's conclusive that cell phones cause brain cancer but I suppose it would be wise to not be excessive. 5 stars. MW