Several NSF funded Research Experiences for Undergraduates (REU) programs allow students to actively participate in research in a specific field. Students engage in faculty-supervised research and receive a stipend, travel, and living expenses. CU-Boulder currently has REU programs in the following areas:

Behavior, Ecology, and Evolution
(Department of Ecology and Environmental Biology)
http://www.colorado.edu/eeb/EEBprojects/reu/

Environmental Engineering
(Department of Civil, Environmental, and Architectural Engineering)
http://civil.colorado.edu/~silverst/REU/

Functional Materials Science and Engineering
(Department of Chemical and Biological Engineering)
http://www.colorado.edu/che/reu

Physics
(Department of Physics)
http://www.colorado/physics/Web/reu/index.html

Extreme Ultraviolet Science and Technology
(Extreme Ultraviolet Science and Technology Center)
http://euverc.colostate.edu/