Category: Science

Sir Isaac Netwotn’s three laws of motion. Three states of matter (solid, liquid, gas). We live on the third rock from the sun. Our metric system of measurement uses metre, litre, and gram. Morse code is a reliable system as the signal is made up of only three parts – a long ‘on’, the dash; a short ‘on’, the dot; and an ‘off’ signal. Do you know what SOS means in Morse code?

Posted on by — Leave a comment

Stem (science, technology, engineering, and mathematics) teaching with the Triple Helix Project

Rensselaer Polytechnic Institute Professor Receives $2.9 Million NSF Grant To Support Innovative Approach to Teaching and Learning STEM Disiplines

triple helix STEM teaching

“The Triple Helix” Project Explores Opportunities for Collaboration Between Universities, Local Schools, and Community Organizations To Focus on Research Related to Community-Based Issues in the Capital Region

Rising concern about America’s ability to maintain its competitive position in the global economy has renewed interest in science, technology, engineering, and mathematics (STEM) education. The challenge, according to Rensselaer Polytechnic Institute Science and Technology Studies Professor Ron Eglash, is that minority students are often disinterested in STEM academics because they do not see its relevance to their own lives and communities.

 

Continue reading Stem (science, technology, engineering, and mathematics) teaching with the Triple Helix Project

Posted on by — Leave a comment

The Triangles of the Neck

From Grey’s Anatomy

The side of the neck presents a somewhat quadrilateral outline (See figure below), limited, above, by the lower border of the body of the mandible, and an imaginary line extending from the angle of the mandible to the mastoid process; below, by the upper border of the clavicle; in front, by the middle line of the neck; behind, by the anterior margin of the Trapezius. This space is subdivided into two large triangles by the Sternocleidomastoideus, which passes obliquely across the neck, from the sternum and clavicle below, to the mastoid process and occipital bone above. The triangular space in front of this muscle is called the anterior triangle; and that behind it, the posterior triangle.    1

Anterior Triangle.—The anterior triangle is bounded, in front, by the middle line of the neck; behind, by the anterior margin of the Sternocleidomastoideus; its base, directed upward, is formed by the lower border of the body of the mandible, and a line extending from the angle of the mandible to the mastoid process; its apex is below, at the sternum. This space is subdivided into four smaller triangles by the Digastricus above, and the superior belly of the Omohyoideus below. These smaller triangles are named the inferior carotid, the superior carotid, the submaxillary, and the suprahyoid.

 

Continue reading The Triangles of the Neck
Posted on by — Leave a comment

technology in three

 The first (number system) digit in the 12-digit UPC Version A (Universal Product Code for North America) barcode is 3 for drugs, beauty aid and health products, (followed by 5-digit manufacturing code, 5-digit product code and 1 check digit at the right end).

 

 The number of hands on a regular mechanical clock or watch, showing hours, minutes and seconds.

 

The number of primary colors of paper printing inks (for books, magazines…) or dyes: cyan, magenta and yellow, (together with black). Mixing these 3 primary colors gives black. They are 3 secondary colors of light.

 

The number of secondary colors by mixing primary colors of paper printing inks (for books, magazines…) or dyes: red (magenta and yellow with equal amount), blue (magenta and cyan) and green (yellow and cyan). They are 3 primary colors of light.

 

The number of primary colors of light (such as for TV screen): red, blue and green. They are 3 secondary colors of pigments. Mixing these 3 primary colors of lights gives white.

 

The number of secondary colors of light (such as for TV screen): yellow (mixing red and green with equal amount), cyan (blue and green) and magenta (red and blue). They are 3 primary colors of pigments.

 

 The number of letters in the name codes for U.S. radio stations, assigned by the Radio Act in 1912. Other: 4.

  

Rule of thumb: Twice as much power or intensity of sound is measured by 3 decibels (or exactly 10×log102) decibels higher.

 

 The name “3M” stands for “Minnesota Mining and Manufacturing Company”, founded in Two Harbors, Minnesota in 1902.

 

The popular Alkaline-Manganese battery voltages for household electronic devices: 1.5V – 3V – 4.5V – 6V – 9V, available in popular sizes: AAA, AA, C, D, G and N. The Carbon-Zinc batteries have additional values: 12V – 22.5V – 45V and 90V. Other values: PP3 – 1.2V – 3.6V – 4.8V – 8.4V for Ni-Cad rechargeables.

 

 

The powers of commercial incandescent light bulbs: 300W, 100W, 75W, 60W, 40W, 30W, 15W, 7.5W and 3W.

 

Nuclear accident at Three Mile Island (near Harrisburg, Pennsylvania) occurred in 1979. (The island may be actually only 2.5-mile long).

 

The “number system” code of an EAN-13 barcode for the U.S. and Canada’s products: 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12 and 13.

 

Frequency Ranges

 

Range

Names

Uses

3 Hz –

300 Hz

Extremely Low Frequency (ELF)

Telegraph

300 Hz –

3 KHz

Voice Frequency (VF)

Telephone Circuitry

3 KHz –

30 KHz

Very Low Frequency (VLF)

High Fidelity

30 KHz- 300 KHz

Low Frequency (LF)

Maritime Mobile

300 KHz –

3 MHz

Medium Frequency (MF)

Navigational Radio, Land-maritime Mobile

3 MHz –

30 MHz

High Frequency (HF)

Maritime, Aeronautical, Amateur Radio

30 MHz –

300 MHz

Very High Frequency (VHF)

Maritime, Meteorological Communication, Television

300MHz –

3 GHz

Ultra High Frequency (UHF)

Television, Military, Low Range Radar

3 GHz –

30 GHz

Super High Frequency (SHF)

Space, Satellite, Microwave

30 GHz –

300 GHz

Extremely High Frequency (EHF)

Radio Astronomy

 

3.6

The voltage of a Ni-Cad rechargeable battery of type AA, AAA, C, D and N is usually 1.2V (less than 1.5V of non-rechargeable batteries). Other values: PP3 – 1.2V – 3.6V – 4.8V – 8.4V.