Hello and welcome to the Intelligence on Economist Radio. I'm your host, Jason Palmer.

Every weekday, we provide a fresh perspective on the events shaping your world.

To be a Democratic presidential candidate in America these days is to have big, transformative ideas.

But those ideas would go nowhere if Republicans maintain their Senate majority.

Problem is, the best contenders to take back Senate seats are too busy buying for the presidency.

And the Democratic Republic of Congo is one of the largest sources of quinine,

a chemical that protects against malaria.

It also has the world's second highest rate of the disease.

We look into why a homegrown cure isn't having enough effects.

But first... More than 200 people were detained yesterday in Russia after protesters marched across the country.

Demonstrators uploaded videos of

chance calling for freedom and criticizing President Vladimir Putin. There had been a week

of outcry after the arrest of journalist Ivan Golunov, who had dug into official corruption.

When Mr. Golunov was released, he thanked his supporters and said he hoped no one else would face the same fate.

It looked like a win for free speech. The truth is more complicated.

Yesterday was an important day for Russia. It actually was a national holiday.

Arkady Ostrovsky is the economist's Russia editor.

So what happened yesterday on this national holiday, on this national day,

is that the Russian liberals, the opposition came out in the streets under the Russian flags.

Protesting against police brutality, protesting against the lack of the rule of law,

defending a journalist, a prominent journalist who had been

a week before that was arrested and had drugs planted on him.

...