Google Vs Bing - Who provides the right answer?

I started 'how to' and Google came up with a list. Topping that list was 'How to get pregnant'. I was curious to see what Bing produces and it had 'how to tie a tie'.

I tried Bing in IE as well as Chrome. The same trial was done with Google in IE and Chrome. Luckily, there was no difference (as it should be).

Cuil, whereas came up with 'how to choose'.

Not sure how page ranking is applied and why Pregnancy should be something on top in Google's search !