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Many science projects investigate a combination of independent and controlled variables to see what happens as a result – the dependent variable. To get reliable results from your experiments, you change the independent variables carefully and the controlled variables as…
A sigma value is a statistical term otherwise known as a standard deviation. Determining the standard deviation of a set of values helps a statistician or researcher to determine if the data set is significantly different than a control set.…
Nothing messes up an equation quite like logarithms. They are cumbersome, difficult to manipulate and a little mysterious for some people. Luckily, there’s an easy way to rid your equation of these pesky mathematical expressions. All you have to do…
When most people hear “rabies,” they imagine snarling animals dramatically frothing at the mouth. While this is definitely a simplification and not always true, it is also not completely false. Rabies is a deadly and frightening disease that can affect…
A black spider with white dots just went scuttling past you in the garden and you wonder if you should be worried. Most of the black spiders with white spots you’ll find are a type of jumping spider and are…
The inchworm, the larval phase of a North American moth species, goes through four stages during its life cycle: egg, larvae, pupae and adult. The name applies to not just one, but thousands of moth species in the family Geometridae…
Grassland ecosystems are land areas dominated by grasses that have very few or no woody shrubs or trees. Temperate grasslands are characterized by their lack of trees and extreme temperature ranges between summer and winter. Despite their lack of trees,…
Earthworms play an important role in many ecosystems, breaking down rotting organic matter into its simple components for use by plants. While earthworms may seem simple because they lack many visible external organs, they have complex inner organs including five…
A circle is a geometric form of which every point on the outside of the circle is the same distance away from the center. The distance around the edge of the circle is called the circumference. The distance from one…
Grasslands make up one of Earth’s major terrestrial biomes. Dominated by grasses and shaped by other biotic factors, different types of grasslands exist in tropical and temperate climates. Tropical grasslands cover much of Africa, Australia, South America and India, including…
