[R] ggplot2 Histogram with density curve

[wwreith]

I am learning ggplot2 commands and I have figured out how to create
histograms and density curves but I am not sure how to add a density curve
on top of a histogram. 

Here are the two graphs that I created. 

## Histogram
t<-rnorm(500)
w<-qplot(t, main="Normal Random Sample", fill=I("blue"), colour=I("black"),
geom="histogram")
w

##Density Curve
t<-rnorm(500)
r<-qplot(t, main="Normal Random Sample", colour=I("black"), geom="density",
adjust=4)
r

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