Ngo,+Hai+(Timmy)

Some things that I already knew about motion sensors were: Some things that I didn't know about motion sensors were:
 * motion sensors use light source as a detection mechanic; when an object passes through the space between the light source and the sensor, the sensor will activate because the light source is being blocked
 * some use sound waves or pulses to monitor the pattern in that specific area, when the pattern is disrupted or changed, the sensor will respond by activating
 * ir (infrared) sensors are used by monitoring all incoming warm objects that give off radiation ex: humans; this lets the sensor know when to activate such as when they are being approached by a heat source
 * photo sensors used in motion sensors rely on a light source to make an electric current also known as the photoelectric effect
 * electrons get expelled when light source is met; they get excited in a sense
 * rattlesnakes have "pits" on the sides of their head which gives them ir detection; this allows them to be stealthy

Timmy, Good job! Looks like you picked out a lot of good points! 5 stars. MW

Several things I didn't know before watching this video was that lower molecules have higher boiling points. I also never knew that crude oil cannot be used. Crude oil must be distilled. Heating crude oil will get you diesel oil, gasoline (petrol), fuel oil, kerosine, and etc. Several things relevant to our class was the distillation that is used to distill crude oil. It is done so it makes crude oil become useable. Fractional distillation is used to separate hydrocarbons from the crude oil, and is collected. The hydrocarbons siphon through the condenser and condense to liquid.

Timmy, OK. Good post. The hydrocarbons are not siphoned however. :) 5 stars. MW

My article was called "Itching to Know More About Itch".

Some things that I already knew about the topic included:
 * knowing that poison ivy is leafy-green and has three leaves sprouting from each individual stem
 * the infected are treated with medical oils in various forms
 * when afflicted with the rash, it causes an intense itching sensation

Some things that I learned from reading the article included: Timmy,
 * hot water being able to suppress the itch, leading to the hot shower/bath home-remedy
 * the medical oil used to treat the rash contains capsaicin, which is the compound in hot peppers that cause pain
 * most common cases of itch begin when medical or mechanical stimulus make contact with the skin

Looks good! There is a lot of poison ivy around here so this is an appropriate article. 5 stars. MW