Hello and welcome to the History Hour Podcast from the BBC World Service with me Max Pearson,

the past brought to life by those who were there.

This week, how Britain tried for 40 years to find a cure for the common cold by deliberately infecting thousands of volunteers.

Let's have you back on the bed.

So this is the virus then and we're going to put it into your nose.

Chisholm.

Also the daughter of a high-ranking Cuban officer executed

for alleged drug smuggling in 1989. The most difficult moment was when the judge

read out the death sentences and I shouted

out to my father that he shouldn't worry and that I would do everything I could for him.

And...

The real life gentleman Jack now seen as a mold-breaking modern lesbian.

But before all that we're going to look at a seminal moment in the history of the ivory trade.

For centuries people have killed elephant. seminal moment in the history of the ivory trade.

For centuries, people have killed elephants, hippos, walruses and narwhals for their tusks,

which are valued for the decorative quality of the ivory.

But increasingly, over the last century,

campaigners and governments have warned that the practice is driving some species

to the brink of extinction. This applies in particular to the African elephant.

30 years ago to highlight the threat from

poaching Kenya staged a dramatic bonfire in Nairobi National Park.

12 tons of poached ivory was set on fire by President Daniel Arup Moy in front of the world's media.

...