Light Bulb - Social Scientist

Q: How many social scientists does it take to screw in a light bulb?
A: They do not change light bulbs; they search for the root cause as to why the last one went out

Yankees to Screw In Light Bulb

Q: How many yankees does it take to screw in an lightbulb
A   None. Thats what rednecks are for.

Light Bulb - Dartmouth Students

Q: How many Dartmouth students does it take to change a light bulb?
A: None--Hanover doesn't have electricity! Note: Dartmouth is way out in the middle of nowhere in New Hampshire.