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Boolean Logic

Boolean logic consists of three logical operators:

OR,  AND,  NOT

OR logic collates the results to retrieve all the unique records containing one term, the other, or both. The more terms or concepts we combine in a search with OR logic, the more records we will retrieve

The more terms or concepts we combine in a search with AND logic, the fewer records we will retrieve.

A few Internet search engines make use of the proximity operator NEAR. A proximity operator determines the closeness of terms within the text of a source document. NEAR is a restrictive AND. The closeness of the search terms is determined by the particular search engine. Google defaults to proximity searching by default.

NOT logic excludes records from your search results. Be careful when you use NOT: the term you do want may be present in an important way in documents that also contain the word you wish to avoid.

Logic Gates
Logic Gates
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three-point landing

3 point landing

NOUN: An airplane landing in which the two main wheels and the nose wheel, tail wheel, or tailskid all touch the ground simultaneously. Continue reading three-point landing

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Color television

Television tube

Baird was an early pioneer in this area, and one of the first techniques developed employed a system whereby the normal frame frequency was increased by a factor of three, each successive frame containing the material for one primary color. Continue reading Color television

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How small can a genome be and still remain functional?

Henry Gee investigates

 

Tuesday April 24, 2001 The Guardian

 

Once upon a time, many hundreds of millions of years ago, a few bacteria – a committee of microbes – got together to form the first eukaryote, the first cell with an organised nucleus.

Continue reading How small can a genome be and still remain functional?

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Liquid

one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from solid and gas, in which a substance has a definite volume but no definite shape.    1
 

Continue reading Liquid

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Brain membranes

Brain membranes

The brain and medulla spinalis are enclosed within three membranes. These are named from without inward: the dura mater, the arachnoid, and the pia mater. Continue reading Brain membranes

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The Triple Triumph of the Moon by Isaac Asimov

The moon made it possible for man to evolve and so exist.
The moon made it possible for him to develop mathematics and science.
The moon made it possible for him to transcend Earth and conquer space.

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THREE CHEERS FOR THE RED, GREEN, & BLUE!

Red, green, and blue are the colors that the first astronauts to Mars might plant there. The three colors were chosen recently by the Mars Society for its first Martian flag. The Mars Society is a group of scientists and laypeople whose goal is promoting the exploration and settlement of the Red Planet. Continue reading THREE CHEERS FOR THE RED, GREEN, & BLUE!

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Numerology

In the science of numerology, a person with the birth number of Three show a keen, intuitive mind, with the ability to learn things rapidly, often at an early age. Talent, versatility and gaiety are their traits.

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Differentiating wavelengths

Brain

Normal humans have three different types of cones with photo-pigments that sense three different portions of the spectrum. Each cone is tuned to perceive mostly either Long wavelengths (reddish), Middle wavelengths (greenish), or Short wavelengths (bluish), referred to as L-, M-, and S- cones. Continue reading Differentiating wavelengths

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Color Wheel

Primary colors

Primary colors

Primary colors

 

PRIMARY COLORS – Red, yellow and blue

 

Secondary colors

Secondary colors

 

SECONDARY COLORS – Green, orange and purple – from mixing primary colors

 

Tertiary colors

Tertiary colors

 

TERTIARY COLORS – Yellow-orange, red-orange, red-purple, blue-purple, blue-green and yellow-green – from mixing secondary colors.

 

Continue reading Color Wheel