My brain must be off because I hate the latter two.

Same, but why I keep coming back to HN for these irrelevant stories I don't know.

Plus Google is convenient so I use it but I can hardly say I "love" it.

"[Brian Knutson] has consistently found that the pictures inside our skulls show that the possibility of a payoff is much more stimulating than actually getting one."

There's evolutionary motivation to stop and smell the roses. Who knew? (Or at least to walk a little slower past them.)

This is the type of information you can use to good effect for making your website stickier.

At the same time, you need to be careful to make sure you don't abuse the power you gain from these techniques.

Hm. This probably applies more to HN then to Google.