REU (Research Experiences for Undergraduates). Does anyone know about this program? There are so many universities with REUs, so how many of them should one apply to? Also, how selective are they and what do they expect? Will they look down upon a freshman with only single-variable honors calculus and linear algebra, mechanics/E&M/waves, and first year honors general chemistry? (as opposed to multivariable calculus, organic chemistry, and quantum physics?) I'm currently a high school sophomore going into university next year so I would love to be enlightened with information about REUs. Thanks! Also - is prior research experience required? It would be my first experience in actual research. And are students applying from the same university hosted by the REU advantaged? Also - are any of them friendly to freshman who aren't so exceptional?