The 13 Most Important Numbers in the Universe - James D. Stein's Cosmic Numbers In the 17th century, scientists understood three phases of matter—solids, liquids and gases (the discovery of plasma, the fourth phase of matter, lay centuries in the future). Back then, solids and liquids were much harder to work with than gases because changes in solids and liquids were difficult to measure with the equipment of the time. So many experimentalists played around with gases to try to deduce fundamental physical laws. Robert Boyle was perhaps the first great experimentalist, and was responsible for what we now consider to be the essence of experimentation: vary one or more parameter, and see how other parameters change in response. It may seem obvious in retrospect, but hindsight, as the physicist Leo Szilard once remarked, is notably more accurate than foresight.
The History of Encryption The History of Encryption 700 BC Scytale The Spartan military used scytales to send sensitive missives during times of battle. Both sender and recipient had a wooden rod of the exact diameter and length. To encrypt a message, the sender tightly wound a piece of leather or parchment around the stick and wrote a message on it. Home uses for Hydrogen Peroxide for disinfection and sanitizing Many home uses for hydrogen peroxide are all about disinfection and sanitizing. Or, to say it another way: OUT WITH THE GROSS! Many of the benefits of hydrogen peroxide begin with its value in killing germs. I've been using hydrogen peroxide for years, and some of my favorite uses are for disinfection.
The 5 Minute Trick to Dramatically Improve Quality Time with Your Kids My wife and I both have demanding jobs – mine as a partner at a product development company and hers as a managing director at a transfer pricing consulting company. We also are proud parents of a three year old, with another one imminently arriving. The juggling act has been something neither of us have ever been fantastic at. For me, it’s proven difficult at times to shut work off and fully engage.
2011 May 7 - Dawn of the Planets Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2011 May 7 Neuroscience For Kids The smell of a flower - The memory of a walk in the park - The pain of stepping on a nail. These experiences are made possible by the 3 pounds of tissue in our heads...the BRAIN!! Neuroscience for Kids has been created for all students and teachers who would like to learn about the nervous system. Discover the exciting world of the brain, spinal cord, neurons and the senses. Use the experiments, activities and games to help you learn about the nervous system. There are plenty of links to other web sites for you to explore.
www.columbia.edu/~sss31/rainbow/murphy.combat.html 1. If the enemy is in range, so are you. 2. Incoming fire has the right of way. 3. Don't look conspicuous, it draws fire. 4. There is always a way. 5. The easy way is always mined. 6.