Gamma Rays

Gamma rays are generated in nuclear explosions. They are electromagnetic waves that have enough energy to kill or damage living cells. Also their energy ranges from millions of electron volts, to thousands of electron volts. Since they have such dangerous energy, gamma rays are used with the advantage of killing cancerous cells. That is why they are used in hospitals. While learning about this topic, I found it very interesting that gamma rays are used in hospitals to kill cancerous cells that could prove harmful for patients. This topic was very helpful in understanding what gamma rays are and what they are used for.

President Inauguration 2009(S.S.)

On January 20, 2009, Barack Obama was inaugurated in front of millions of people and officially announced the president of the United States of America. This day was very important in history not only because we got a new president, but also because he was the first ever African American to become president of the United States.
During the inauguration, President Barack Obama gave a speech that was both practical and hopeful for the country. He understood his responsibilities and swore to fulfil them. Not only that, but he even acknowledged the fact that the country was going through very bad economic problems and that he would try his hardest to help the country get back in shape.
Throughout his campaign, Barack Obama has fascinated not only the citizens of America, but also people from around the world in other countries and nations. He understands how hard he will have to work in his years of presidency and is determined to do whatever he can to help America get out of the economic crisis its stuck in. With Barack Obama as the president, there are many expectations from citizens who know Barack Obama will do the country good.
After watching the inauguration and reading articles about Barack Obama, it is no doubt that he won't work his hardest. My opinion in this topic is that I think Barack Obama will be a great president for the United States and that he won't let the country down.

What is Energy?

Energy is the ability to do work. Two states of energy are kinetic energy and potential energy. Kinetic energy is energy of motion. Some examples of this would be electrical energy, radiant energy, thermal energy, motion energy, and sound energy. Potential energy is stored energy. Some examples of potential energy are chemical energy, stored mechanical energy, nuclear energy, and gravitational energy. Radiant energy can either be visible or invisible to the human eye. An example of radiant energy could be the sun's rays hitting Earth. Radiant energy is also known as solar energy. Gravitiational energy is energy that exists between two or more masses. An example of this could be an object falling off a high cliff or mountain. While studying the different forms of enegy, I learned that everything around us uses energy to work. This topic was interesting to learn about and I hope to learn more.