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Cladie Aide.

Load to games, loads of fun, loads of screaming.

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Hello and thanks for downloading the Witness History Podcast from the BBC World Service

with me Claire Bose. Today we're remembering an invention which has saved the lives of millions worldwide.

In 1956, an American scientist called Charlie Thiel helped create the metered dose inhaler for people with serious

breathing problems such as asthma. Asma is a common respiratory disease that can sadly lead to death even today.

Stephen Stein works for Kindiva drug delivery, formerly Reikka Laboratories,

the company which invented the first metered dose inhaler, which has

transformed the lives of asthma sufferers around the world.

Asma makes it difficult to exhale, which is a little different than one might think,

but by not being able to exhale, they're not able to get fresh oxygen-rich air into their lungs.

The airways narrow and swell, and an attack can escalate quite quickly.

In the midst of attack, it's terrifying.

It's terrifying for caregivers, for parents of young children. I have a daughter who has mild asthma and that is a frightening thing when your child is struggling to breathe.

According to the World Health Organization,

more than 300 million people have asthma,

...