Today - from a teenage DIY invention, to US national TV, to changing legislation, and now global sales. What started as a way to protect a friend who’d been drugged at a college bar became a product made from an old hair scrunchie and her mum’s stockings.

Shirah Benarde tells us how she set up NightCap, a business that’s grown from a bedroom prototype, to securing investment on the Shark Tank show in the US, to a global safety brand in just a few years.

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Presenter: Sam Fenwick

Business Daily is the home of in-depth audio journalism devoted to the world of money and work. From small startup stories to big corporate takeovers, global economic shifts to trends in technology, we look at the key figures, ideas and events shaping business.

Each episode is a 17-minute, daily deep dive into a single topic, featuring expert analysis and the people at the heart of the story.

Recent episodes explore the weight-loss drug revolution, the AI boom, why bond markets are so powerful, China's property bubble, and Gen Z's experience of the current job market.

We also feature in-depth interviews with company founders and some of the world's most prominent CEOs. These include Google's Sundar Pichai, Wikipedia founder Jimmy Wales, and the CEO of Starbucks, Brian Niccol.

(Picture: Founder of NightCap, Shirah Benarde. Credit: Shirah Benarde)