Dartmouth's laid back atmosphere?

<p>Dartmouth is one of the colleges on my list for next year. I was comparing Dartmouth to its similar counterparts (Cornell, Brown, etc) and I was wondering about the course rigor in the science majors. How deep do the science courses go in terms of course breadth?</p>

<p>I know these majors usually tend to be a harder part of the university, but I also enjoy the laid back atmosphere from Dartmouth. Would it be possible being a science major (biology) and still be part of the laid back atmosphere (compared to the other ivies) at Dartmouth?</p>

<p>Also, can someone comment about the professor's grading? Are there any grade inflation/deflation? Is an 'A' mostly 90+ or is it like only the top 20% get A's, and if somehow the top 20% scores 95+, a person not in the top 20% (say with a 92), will get a B+ or worse.</p>