My school runs on the trimester system. Next quarter, I will start my upper-div physics by taking classical mechanics. Along w/that I'll take a lower-div physics lab, and upper-div DEs. I want to also take abstract algebra, since I've found my 1st quarter of upper-div math to be more interesting than my current physics classes. I want to wait to do undergrad research until spring of next year, but I'll be behind everyone else, right? Also, I want to apply to REUs for next summer, so doing research for a prof will give a good letter of rec to apply to REUs, right? Therefore, would it be a bad idea to not do research next quarter (winter) but postpone it to spring?