Hildebrand,+Kelston

Motion Detector: I learned that there are three different methods that motion detectors use today. One such method is a light source using infrared radiation pointed at a photo sensor. When this path of radiation gets disrupted it sets off the detector. Others use radio or microwaves that bounce of an object and come back to the source signaling motion. Much like sonar or echolocation. The third method is a device that detects heat coming off of a living thing because they emit infrared radiation themselves. Some examples of motion detectors are garage door sensors, shopping center's automatic doors, and a rattlesnakes "vision."

Kelston, Also write about things that you already knew - 4 stars. MW

Distillation: It was interesting to find out that they heated the crude oil mixture in hot water instead of using an open flame, during the process of distillation. When they need to do this process on a large scale they use a larger tube and an electric heater for safety. Again not using an open flame. The longer the molecules the higher the boil point. This also means that they will run out of the tube at different points on the tube. They fracture the crude oil into different sections depending on the point at which they boil. Oil is very important to our society and every product we use is impacted or has touched by this compound. We separated the blue crystals from the water using a process like this and we saw the rising and falling of the vapors.

Kelston, Very good! Thorough post. 5 huge stars. MW

I found out that blood banks were started in the 1930s and before that they did a whole bunch of different things as you will read. Before this doctors would put wine or even saltwater in peoples blood systems. Hemoglobin, which is in our blood, is actually toxic to us by ourselves. I knew that blood could only last for 28 days in cold storage. I knew hemoglobin was in blood but not the fact that it could be toxic. I knew AIDS caused a big hooplah, especially with the blood banks.

Kelston, OK, but you might want to check your date on AIDS (not aides) MW