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Cosplay is the ultimate form of fancy dress – with fans of graphic novels and video games doing everything they can to emulate their favourite fictional characters. And it's a big money-spinner globally.We find out why the hobby has grown so much over the past two decades – and meet those who’ve turned their passion for cosplay into a career.If you would like to get in touch with the show, please email: businessdaily@bbc.co.ukPresented and produced by Will Chalk(Picture: Cosplayers pose as Star Wars characters during New York Comic Con 2024, in New York City. Credit: Getty Images)

The festival of Kumbh Mela is estimated to attract 400 million Hindus and other visitors from around the world. The 45-day festival is a massive economic engine, injecting billions in the economy of the northern state of Uttar Pradesh, which is hosting the event. And this year, it is a Grand Mela, which only happens once every 144 years. From big businesses to street vendors and hotel owners, to major brands and digital entrepreneurs, all are looking to cash in on the influx of visitors.If you would like to get in touch with the show, please email: businessdaily@bbc.co.ukPresented and produced by Devina Gupta(Image: Shoppers next to a toy stall at Kumbh Mela in 2023. Credit: Getty Images)

How to make a battery powered plane that can fly long distances, whilst carrying passengers, is a key challenge facing the aviation sector.As the world tries to reduce its consumption of fossil fuels, researchers are looking to make flight more sustainable to deal with ever growing demands. We hear about some pioneering projects in the Netherlands which are trying to do all of this, whilst still being commercially viable.If you would like to get in touch with the show, please email: businessdaily@bbc.co.ukProduced and presented by Matthew Kenyon(Image: A render of Dutch start up Elysian's fully electric regional aircraft, which it says will have a range of 500 miles. Credit: Elysian)