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, rare voices from the First World War in Africa.

The white man came with a doctor and instructed the from the first world war in Africa.

The white man came with a doctor and instructed the recruits to line up and take off all their clothes.

The doctor then tested the recruits for any diseases and handed them over to another officer for more testing.

Plus, the invention in the 1970s of a revolutionary sign language

to help those with difficulty communicating,

the evolution of mid 20th century theories of parenting,

and the man who changed our solar system

by deciding Pluto was just too small.

I got actual literal death threats,

which is just kind of astounding that people would feel so

strongly about Pluto.

All that coming up later in the podcast but we're going to begin on the streets of

New York in the 1980s when a group of anonymous female artists took a stand against what they saw as the male domination of the art world. The campaign was visually striking. The women began wearing guerrilla masks to disguise their identities and fly posting around the city's museums and galleries.

They hope to achieve a greater representation for women and ethnic minorities in the art world.

Laura Fitzpatrick has been talking to two of the so-called

guerrilla girls.

One of the more unusual sites to be seen in the streets of New York City is women wearing guerrilla masks fly posting.

Women are the guerrilla girls and their posters are stylish and witty attacks on what they see as the male domination of the American art market.

The guerrilla girls were artists fed up with sexism and racism that they saw in museums and

galleries, not just in America, but around the world.

...