And subjects that you have to really work to get your head around are often the most interesting ones.

Here are a few of the more interesting ones I have come across.

We hit it off right away, chatting about various cases we'd worked, at least the interesting ones.

Here are some of the more interesting ones that I have encountered.

Of these tense photographs, the most interesting ones have more than one person in them.

It had a lot of nice touches, and some interesting ones.

There were questions asked in Parliament about this, but not very interesting ones.

If anyone has any interesting ones then we'd like to hear them.

It's a hard problem, but those are always the interesting ones.

It was one of the more interesting ones if you ask me.