Explains modal logic by means of logical notation. Somewhat difficult for a non-specialist to appreciate. However, the introductory section does provide a general definition of "modal logic."

[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will define a mixture and understand why mixtures are different than pure substances. They will classify mixtures as homogeneous or...

Students learn to impose a grid on a line to quantify the steepness of a line. They learn that slope is the ratio of vertical change divided by the horizontal change. They also learn that lines can have slope that are positive, zero,...

Based off of the hit television show NUMB3RS, this lesson introduced students to simple coding techniques (namely, the shift cipher). Students learn to translate codes from nonsense to English by quantifying each letter, and then...

In this biology field lab, students will collect insects from two different habitats and use them to quantify the biodiversity of each habitat.

Learn how to enhance economic development and growth. Learn the role of the United States Geographic Survey on locating, quantifying and qualifying non-renewable resources.

Mass spectrometers are machines that give scientists a look at the composition and origin of a material by analyzing and quantifying its atoms and molecules. This tutorial shows how a dual sector mass spectrometer works. (Java tutorial)

Mass spectrometers are machines that give scientists a look at the composition and origin of a material by analyzing and quantifying its atoms and molecules. This tutorial shows how a single sector mass spectrometer works. (Java tutorial)

In this activity, students will capture and examine the particles to gain an appreciation of how much dust, pollen and other particulate matter is present in the air around them. Students will place "pollution detectors" at various...

Students set up a simple way to indirectly observe and quantify the amount of respiration occurring in yeast-molasses cultures. Each student adds a small amount of baking yeast to a test tube filled with diluted molasses. A second,...

Students learn a simple technique for quantifying the amount of photosynthesis that occurs in a given period of time, using a common water plant (Elodea). They can use this technique to compare the amounts of photosynthesis that occur...

Great introduction to basic ideas in predicate logic. Conveys fundamental ideas without using technical notation. A good place to start.

This page explains the proper use of the singular words "each" and "every" and provides examples.

Learn how to classify matter into elements, compounds, and mixtures while watching this interactive lesson. Listen to the explanation while you discover how to differentiate between different types of matter.

Animation going from the Milky Way all the way down to inside an atom by powers of ten. This animation helps illustrate and quantify the powers of ten.

Read about the work of Louis Agassiz and Samuel Morton, who tried to quantify humans into racial stereotypes. This article is a transcript of a radio broadcast.

This site has many links to examples of inverse functions, including intersections, inverse by reflection, and graphing inverse functions.

[Free Registration/Login Required] Discover the composition of matter and the relationship between matter, atoms, and elements. Students will learn the differences between elements and compounds, and how molecules are formed. Chemical...