What are 4 examples of physical systems designed by people?
science - PsyDAG, Tuesday, April 2, 2013 at 1:02pm
Since this is not my area of expertise, I searched Google under the key words "examples of physical systems designed by people" to get these possible sources:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
science - tshepang, Saturday, April 6, 2013 at 5:00am