Amalgamated Industries Think through the consequences associated with the development of a widget plant upstream of the Alma Mater school. While the plant will be good for the region’s economy, will it release widgoxyn—a deadly chemical known to interfere with aquatic food webs—in such quantities that it will irreparably damage the stunningly beautiful Alma Mater Pond?

Predator Prey Dynamics This simple case facilitates experimentation with the dynamics of a predator-prey system. In the case, the user is asked to experiment with different predator harvests, and observe the effects on both the predator and prey populations over time.

Mysteries of Easter Island Easter Island has long been viewed as deep in mysteries. Why does the island have so many statues? Why is the landscape so stark and forbidding? And why does the island support so few people? Conduct simulations to explore the effect of different birth rates on the long-term sustainability of the population and its island habitat.

Plant Succession This model represents the progression that plants go through in a forest ecosystem, from forb to hardwood with each plant type readying soil conditions for the next type in the progression.

Natural Selection Pressure In this model, a rabbit population comes under a natural selective pressure from a fox population. The average speed of the rabbit population increases as a result. You can experiment with the strength of the natural selective force.

Simple Nitrogen Cycle This is a model of a basic nitrogen cycle, bringing the typical textbook diagrams to life by enabling students to play with the parameters which impact the cycle's dynamics.

Virtual Hamlet This model, illustrates how STELLA can be used to create a virtual laboratory for exploring the plot and character development of a piece of literature. What would happen if Hamlet where a “man of actions” as opposed to a “man of thought?” How would different characterizations change both the timing and the overall ending of the play?

The Balloon Problem This model illustrates how a simple interface can facilitate experimentation with a mathematics model. The model depicts a classic problem in calculus known as the balloon problem. Experiment with different distances and velocities.

Distance and Time Problems This model illustrates how a STELLA model interface can be used to facilitate hands-on experimentation with simple mathematics problems. Experiment with different constant rates of speed.

Non-Separable Differential Equations Analytically daunting or deceptively simple? The model represents a classic problem—that of mixing hot and cold water in a bathtub. Experiment with different water temperatures and with different flow rates, showing the overall impact on the temperature of water in the tub.

President & Prime Minister Whose coffee cools faster? This question quickly becomes relevant for the president and the prime minister as they travel together in a plane. Understand the cooling process. Then experiment with a cooling model.

Temperature Control This model enables you to selectively turn on and off both “P” (proportional) and “I” (integral) controllers for a heat pump that seeks to maintain a constant temperature within a house.

Reversible Reactions Storytelling is used to present the basic structure of a reversible chemical reaction. Experiment with different values for initial concentrations of product and reactant, as well as different rate constants for the forward and reverse reactions.

Virtual Bungee Jumping Virtual bungee jumpers can experiment with different body weights and bungee cord strengths. Then they experiment with different platform heights and even different gravitational fields.

Michaelis-Menten Dynamics The Michaelis-Menten equations are taught in virtually any unit on enzyme kinetics. The problem, for most students, is that the equations are abstract, and it's difficult for students to develop an intuitive sense for the processes the equations are being used to describe. This model provides a simple, physically-intuitive treatment of the enzyme kinetics phenomenon.

Pharmacokinetics In this illustration, you'll learn how STELLA can be use to move from mere memorization to a deeper understanding of pharmacokinetic processes. In the illustration, a simple interactive simulation lays the foundation for understanding the basic processes of drug-physiology interaction.

Extraverts and Introverts This map (not a running simulation model) uses STELLA’s storytelling feature to illuminate the differences between extraverts and introverts.

Immigration Dynamics Understand simplified representation of the immigration process—a process that has driven many waves of immigration over the course of US history. Then, test policies targeted at slowing the movement of immigrants from Mexico into the US, and the movement of industry from the US into Mexico.