R: add R I forgot to add, and update to use las=1 like the others
power: power approach paradox and detectable effect size
regression: add Kanazawa's beautiful babies example
switch math font to newtxmath to get better Libertine match
intro: Expand with more info and examples
data-analysis: add fun quote
power: index "detectable effect size"
significant-differences: comparing confidence intervals works in one situation