India may be overtaking China as the world's most polluted country. Even now, which country is worse depends on the day.

Putin himself is a bit of a risk taker, so the invading Ukraine, in the east in particular - Crimea was risky.

In this country tonight, PBS shows one of the most talked about tributes of the year.

Republicans are now trying to stop Donald Trump. And there was much more ferocious and widespread criticism from Republicans of Trump this time around.

[Democrats] have lost the capacity to speak to the vast middle of America, an America that is, in large part, white, very religious and not highly educated.

Here is a needle President Obama needs to thread if he chooses a ninth. The nominee would need to be so strongly qualified that he or she would be hard to reject. The person must also be willing to be nominated even though leading Senate Republicans have said they will not consider anyone the president names.

I would say that the one incredible thing that Karachi has going for it is the unabated supply of new migrants that pour into it day after day. It could be a poor factory worker who simply wants a job, it could be an ambitious guy coming for an education - they all add hope and vibrancy to the city. Now, this is not something that is generally taken as positive in Karachi. But the hope is that the migration that comes into the city replenishes its stores of resilience and energy.