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Contains three levels: Essence of simple machines where the player learns about all of the types of simple machines and mechanical advantage. Find the simple machine where the player finds the simple machines used in the construction of a lawnmower. Putting simple machines together where the player must correctly calculate the mechanical advantage of various simple machines used to complete a task.

Good site, contains more how and why explanations than "EdHead" does.

You must administer tests on a patient to determine the correct blood type. It seems very engaging.

Here is another site dedicated to understanding and solving math problems. What's interesting about this site is that English and Science are incorporated as well. It's a known fact that these 3 subjects are dependent upon one another and understanding these subjects (as a whole) is essential. This site is geared for the primary grades.

Useful ages 11+ this free, online simulation game allows learners to play the role of an "Oiligarch" an oil baron, building profits but also causing environmental and economic problems. It is useful for natural sciences, social sciences, environmental science, and economics courses.

This game is for high school and beyond. It provides an interactive place for people looking into careers and for changing jobs. It's time consuming but it can be very helpful for people who don't know what they want to do. d_3, gl_C, EV_4, yf_2

Excellent for doing research on concepts related to history of mathematics. diff=3, gl=M,Ev=3,f3