Sinclair,+Allison

I learned three things from this article. One thing I learned was from ritualistic to decorative tattoos have been around for more than 5,000 years. Another thing was around 1 in 8 Americans have tattoos. The state regulates the sanitation of tattoo parlors however the Food and Drug administration does not monitor the actual pigments used in tattooing. I also already new three facts about this article. Dyes used i industrial paint, and cosmetics can be used to create vibrant colors in tattoos. You can get tattoos with glow in the dark or UV activate ink but the chemicals in them could be cancerous. Some tattoo parlors are coming out with removal tattoos, and they're working on better color palettes.

Allison, OK. Looks like you picked up a few tidbits from the article. 5 stars. MW

This demonstration in the video was relevant to our class because it's chemistry. Were currently learning how to separate different substances from each other. We separated sand from water. This demonstration was very similar to the one we performed in class. Using, similar tools and variables.

Allison,

A bit short and sparse on scientific terminology - 3 stars. MW

I learned many things from this article. Some motion detectors use a light source aimed at a photo sensor. A motion is dectected when an object passes through the source and the detector, then the light beam is blocked. Som houses have motion detectors on them like that, and when it sensors movement, a light will instantly come on. Another thing I learned is that different materials have different thresholds, so sensors can be made for most lights. In 1887 this effect was first obsrved by Heinrich Hertz. A high intensity low frequecy beam of light would cause no electrons to be ejected. However a low intensity, high frequency beam of light could sense electrons flying. This article was very informative, but also interesting. One thing I found interesting was rattlesnakes have pits on the side of their head that allow them to detect infared light. Also, many elevators use a beam of light broken by an object to keep from closing on incoming passengers and luggage. Bats send a signal in the form of sound. The echo they hear helps them locate obstacles around them such as, their dinner.

Allison, Please follow the prompt and list things that you knew - along with things that you learned. 4 stars. MW