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# Things I learned This Week! : 3

Posted Feb12-11 at 08:46 PM by Kevin_Axion

I've been pretty busy this week! On Thursday, Friday and today I had to get up at 6:30 and take the subway down to the University of Toronto where I competed in UTMUN (University of Toronto Model United Nations) competitions. Despite the tiresome journey it was a lot of fun and the campus was beautiful. Anyways I have a day to rest before I head back down to Toronto for 2 days for more competitions so I thought I'd spend some time writing this weeks segments of my blog!

Things I learned this Week!

1. "October Sky" is an anagram for "Rocket Boys", the book upon which October Sky is based off of.

2. One Times Square, one of the most well known addresses is mostly vacant.

3. There's a town in the U.S where just 6% of the population speaks English at home, and the language their speaking isn't Spanish or Chinese. It's Hebrew: http://en.wikipedia.org/wiki/Kiryas_Joel

4. Incense has very bad health effects especially in extremely crowded non-oxygenated masses: http://en.wikipedia.org/wiki/Incense#Incense_and_health

5. A desire path, or naturally constructed road is usually the shortest path between two destinations http://en.wikipedia.org/wiki/Desire_path

Equations of the Week!

1. Einstein's Field Equations: $$R_{\mu\nu} - \frac{1}{2}g_{\mu\nu}R + g_{\mu\nu}\Lambda = \frac{8 \pi G}{c^4}T_{\mu\nu}$$

"Einstein's equations are a set of ten equations in Albert Einstein's general theory of relativity which describe the fundamental interaction of gravitation as a result of spacetime being curved by matter and energy.[1] First published by Einstein in 1915[2] as a tensor equation, the EFE equate spacetime curvature (expressed by the Einstein tensor) with the energy and momentum within that spacetime (expressed by the stress-energy tensor)." - Wikipedia

2. Entropy Equation:

$$S = -k\sum_i P_i ln P_i$$

"Entropy is a thermodynamic property that is a measure of the energy not available for useful work in a thermodynamic process, such as in energy conversion devices, engines, or machines. Such devices can only be driven by convertible energy, and have a theoretical maximum efficiency when converting energy to work. During this work entropy accumulates in the system, but has to be removed by dissipation in the form of waste heat.
The concept of entropy is defined by the second" - Wikipedia

3. $$\cal {L}_{QED}$$$$= -\hbar c \bar{\psi} (\gamma_\mu \frac{\partial}{\partial x_\mu} + \frac{mc}{\hbar})\psi - \frac{1}{4}F_{\mu\nu}F_{\mu\nu} - ie\bar{\psi}\gamma_\mu A_\mu \psi$$

"Quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical electrodynamics giving a complete account of matter and light interaction. One of the founding fathers of QED, Richard Feynman, has called it "the jewel of physics" for its extremely accurate predictions of quantities like the anomalous magnetic moment of the electron, and the Lamb shift of the energy levels of hydrogen." - Wikipedia

I hope you enjoyed!
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