Find out what variables are in a scientific investigation and what the difference is between an independent, dependent, and controlled variable. Look at samples of different types of variables and find out what makes a good variable.

In this activity, you will be able to observe the oxygen production in leaves by doing a floating leaf disk experiment. You can also find out how quickly plants produce oxygen, and what variables affect photosynthesis.

EDVAC (Electronic Discrete Variable Automatic Computer) was an early computer that was one of the first to use the binary number system to represent information. This lecture is a brief presentation of the EDVAC.

The purpose of this lesson is to help students apply math concepts of solving systems of equations to real life situations. The students will use the three methods of graphing, substitution, and elimination to solve the system of...

A lengthy page covering most all the gas laws. Each law is described in words and stated as an equation. The use of each law in solving problems is demonstrated. Some problem-solving tips are provided. There are 23 practice problems with...

Play around with the variables involved in rainbows. We know we usually see rainbows following a rain shower. What's the science behind it? Find out with this interactive.