Sine Qua Non

Sine Qua Non 

Sine Qua Non  refers to an indispensable and essential action, condition or ingredient; something that is absolutely indispensable. Example: Determination is a sine qua non for success.

CSRF Protection: When It Breaks, It Breaks Very Quietly

CSRF Protection

Cross-site request forgery (CSRF) is tricking the browser with a malicious (or compromised) site B to access something on site A.  Since requests for site A would include site A's cookie whether requested by A or not, an image tag or embedded JavaScript on site B can submit some requests on site A that a logged-in user can do, like accessing private info with the appropriate POST parameters to make it happen. Rails has a mechanism that defends against CSRF: all one should to do is include a few lines of code as:

class ApplicationController < ActionController::Base

  protect_from_forgery

end

class FooController < ApplicationController

  protect_from_forgery except: :index

Rails will then basically generate cryptographically secure random number, totally transparently to the developer; it is called the CSRF token.

World War III

World War III

World War III was a hypothetical worldwide military conflict subsequent to World War II. Because of the development and use of nuclear weapons near the end of World War II and their subsequent acquisition and deployment by several countries, it is feared that a third world war could cause the end of human civilization and most or all human life on Earth.

This is a video taken in 2015:

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World War III, WWIII, WW3 or the Third World War

Lake Karachay

Lake Karachay, Russia

Used for years as nuclear dumping site by the Soviet Union, Lake Karachay has several times been declared the most polluted place on Earth. In fact, it has been said that just 1 hour of exposure here would be lethal.

Lake Karachay

Lake Karachay, Russia --- After being used as a dumping site for radioactive waste for decades, Lake Karachay, located in the southern Ural mountains in western Russia, got to be one of the most polluted spots in the world.

 

Lake Karachay, Russia --- This is due to radioactive waste that were dumped into the lake by the nearby Mayak nuclear facilities.

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Radio Frequency

Radio Frequency
What is RF?

Radio Frequency (RF) and wireless have been around for over a century with Alexander Popov and Sir Oliver Lodge laying the groundwork for Guglielmo Marconi’s wireless radio developments in the early 20th century. In December 1901, Marconi performed his most prominent experiment, where he successfully transmitted Morse code from Cornwall, England, to St John’s, Canada. RF itself has become synonymous with wireless and high-frequency signals, describing anything from AM radio between 535 kHz and 1605 kHz to computer local area networks (LANs) at 2.4 GHz. However, RF has traditionally defined frequencies from a few kHz to roughly 1 GHz. If one considers microwave frequencies as RF, this range extends to 300 GHz. ... more ... http://www.ni.com/tutorial/3541/en/

RF alternates current (AC) havingcharacteristics such that, if the current is input to an antenna, an electromagnetic (EM) field is generated suitable for wireless broadcastingand/or communications. ... more ... http://searchnetworking.techtarget.com/definition/radio-frequency

SAB Heli Division

SAB Heli Division

The company is focused on designing and building radio-controlled helicopter, Blade/Tail blades for RC Helicopter.

Kyle Stacy 2015 Heli Rodeo

Kyle Stacy 2015 Heli Rodeo

Ribosomes

Ribosomes

Ribosomes are the protein builders or the protein synthesizers of the cell. They are like construction guys who connect one amino acid at a time and build long chains. Ribosomes are special because they are found in both prokaryotes and eukaryotes. More info: https://en.wikipedia.org/wiki/Ribosome

Colloid

Colloid

A colloid is a solution that has particles ranging between 1 and 1000 nanometers in diameter, yet are still able to remain evenly distributed throughout the solution. These are also known as colloidal dispersions because the substances remain dispersed and do not settle to the bottom of the container.  More info http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Colloid

Four Major Groups of Organic Molecules

Four Major Groups of Organic Molecules
 

Group	Examples	Functions
Carbohydrate	Glucose  Glycogen	Short term energy source Transport form in animal Long term energy storage
Lipids	Fats and oils	Components of membranes Long term energy storage Insolation
Proteins	Enzymes  Sucrase and lactase  Keratin  Collagen	Organic catalysts  Digestive enzymes  Structural protein in hair  Structural protein in skin
Nucleic acids	DNA  RNA  ATP	Information molecule Molecule of heredity Director of metabolism involved in protein synthesis immediate source of energy for cellular work

   
Enzyme is a protein which speeds up the rate of chemical reaction without being destroyed by the reaction.

How Many Natural Organic Matters Are There?

How Many Natural Organic Matters Are There?

As recorded from 1779 to 2015, the Reaxys database contains information on over 6 million organic compounds and 10 million single-step reactions. Each record contains information on preparation, reactions, physical and chemical properties and references to chemical literature.

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Reaxys database name used to be Beilstein database in past.