Villier,+Charles

I read the article about poison ivy.

Knew-

1.) I already knew that the oil the comes from poison ivy is called urushiol. 2.) I knew that poison ivy causes itching and creates blisters on skin. 3.) I knew that we had itch-signaling receptors in our nerve cells.

Learned-

1.) I learned that there is an International Association for the Study of Pain. 2.) Bathing in rather hot water is a good treatment for the itch of poison ivy. 3.) I learned that itch ointments work through the process of counterirritation.

Charles, Looks good! 5 stars. MW

Distillation Video:

Didn't Know- That it is safer to heat the initial tubes in the distillation process with hot water in the beginning rather than an open flame because some materials that need to be distilled are flammable.

Interesting-
 * Industry uses the same process of distillation to separate the crude oil but at a much larger scale.
 * The products of the separation of the crude oil at the different temperatures provides us many different things we use in everyday life such as asphalt for roads or gasoline for cars.

Relevant- We will probably need to use the process of distillation to separate out materials in some of our labs so it is important we understand how and why the process works.

Jacob, Well covered! 5 stars! MW

Motion Detector Article:

Already Knew-
 * I already knew that some mtion detectors use light sources that point at sensors and that when blocked the motion is deteceted.
 * I knew that light behaves like a wave in some situations but in others it behaves more like a particle.
 * I knew motion detectors rely on lights ability to initiate an electric current.

Learned- Jake, Good! I like your reference to the frequency of light. 5 stars! MW
 * The general definition for a photo sensor is anything that senses light and that it depends on its abillity to move around electrons.
 * I didn't know that Heinrich Hertz was the first to discover the photoelectric effect I thought that it was Albert Einstien.
 * The energy in photons depends solely on their frequency and the intensity only impacts how many photons there are not their energy.