Discovery BBC World Service

Dr Julia Ravey and Dr Ella Hubber both have a love of science, but it turns out there’s a lot they don’t know about some of the leading women at the front of the inventing game. In Unstoppable, Dr Julia and Dr Ella tell each other the hidden, world-shaping stories of the engineers, innovators and inventors they wish they’d known about when they were starting out as scientists. This week, the story of the Hollywood starlet whose brilliant ideas would go on to revolutionise the way we live.
Known as the ‘most beautiful woman in film’ during the 1940s, Hedy Lamarr was one of the most in demand Hollywood actresses of her time. But she wasn’t just a movie star. From a young age, she also had a knack for inventing – she liked to take her toys apart just to see how they worked. And she carried this passion into her adult life – creating an invention that laid the groundwork for technology many of us couldn’t live without: Wi-Fi, Bluetooth, and GPS.
But it didn’t come without struggle. Dr Julia and Dr Ella take us through Hedy’s remarkable journey, and we get a first-hand look into Hedy’s life from her daughter Denise Loder-DeLuca.
Presenters: Dr Ella Hubber and Dr Julia Ravey
Producers: Ella Hubber and Julia Ravey
Assistant producer: Sophie Ormiston
Editor: Holly Squire

The process of childbirth can be painful yet amazing, but at times and in some places, also very dangerous. Recorded in Malawi, East Africa, Claudia Hammond is joined by a panel of maternal health experts to figure out why it is that the equivalent of a large jumbo jet full of women die every day due to pregnancy or childbirth. Together, they examine how so many women can still be at risk during this period despite a greater access to healthcare. They also look into whether an eighty-year-old drug could be a game-changer when it comes to haemorrhage. Plus, they consider a study of 1.3 million women which asked what it is that women actually want from maternal healthcare. With Owen Chikwaza from the Malawi Ministry of Health, Linda Mipando of Kamuzu University and Elimase Kamanga-Gama, Director of the White Ribbon Alliance Malawi, Claudia looks at the many challenges and successes within the field, drawing from local experiences to offer global insights.
Produced by: Margaret Sessa-Hawkins
Editor: Holly Squire
Production Coordinator: Siobhan Maguire
Presenter: Claudia Hammond
Studio Engineers: Andrew Saunderson and David Sproule
(Photo: Pregnant woman being examined by a doctor. Credit: Holly Squire BBC)

Underwater cameraman Roger Munns set himself and his team an incredible challenge. In 2008, they visited Tonga to film the biggest courtship ritual of the animal kingdom, the humpback heat run, for the very first time underwater and up close.
In the first few days, Roger had intimate encounters with the whales but most of the time, he was sat on the back of the boat, waiting to find a heat run. After two unsuccessful weeks, he started to wonder whether they would ever see one.
But a few days later somebody spotted a heat run, and everything sprang into action. Roger got in position and dove down ten meters underwater on a single breath. From then on, his job was just to wait and hold his camera ready. In a moment that seemed to stretch out time, he waited, nervously, for a group of 40-ton bus-sized whales to speed past him…
And Victor Vescovo describes his adventures into the deep, diving to the deepest parts of all five oceans.
Victor's longest dive was solo to the lowest point on Earth - the Challenger Deep at the bottom of the Marianas trench in the western Pacific. On reaching the bottom, some 35,853 feet below the ocean surface, should something have gone wrong, there was no hope of rescue.
Victor describes his feelings before making this historic descent and on the way down. Touching down on the sea bed, he was astounded by the abundance of marine life. Victor describes how he hopes that the mapping, observations and sample collections he has made on his dives will advance scientific understanding of the deep oceans, and where his eternal quest to explore might take him next.
Produced by Florian Bohr and Diane Hope

Credits:
Humpback whale mother and calf sounds - Acoustic Communications CNRS team & CETAMADA
Humpback whale calf sounds - Lars Bejder (MMRP Hawaii), Peter T. Madsen (Aarhus University) & Simone Videsen (Aarhus University)

Primatologist Catherine Hobaiter has spent more of her adult life in the rain forests of Uganda, with family bands of chimpanzees, than she has with her own human family members. For more than 20 years now she has spent 6 months every year at a remote field station, getting up before dawn every day to observe and collect behavioural data on family bands of chimps as they wake up and go about their daily lives. What is she trying to find out, that has gripped her for so long?
It turns out that life in a chimpanzee troupe is every bit as gripping as a soap opera. But there are many more moments of beauty, revelation and the joy of discovery, as Catherine pursues her continuing, multi-decadal quest to understand what it means to be a chimpanzee.
And when Sara Dykman set out to bicycle with the monarch butterfly migration, from the mountains of central Mexico, across the USA to Canada, she didn't think about the 10,201 miles that she would cover. Coping with headwinds, heavy rain storms, and everything from dirt roads to busy highways were not the challenge for Sara though. It was seeing how little of the Monarch's only food plant, milkweed, was left for them to feed on during their amazing, multigenerational, multinational migration.
However, Sara found solace in the many conservationists and backyard butterfly gardeners she met along the way, and in the 9000 schoolchildren she gave talks to en route. The most emotional part of the journey for Sara was the last three miles - arriving successfully back at the monarch's overwintering site in Mexico.
Produced by Diane Hope.
Credits:
Monarch butterfly recordings - Robert Mackay

Professor Ben Garrod and Dr Jess French get under the skin (and blubber) of the California sea lion, to crack the key to its success both on land and at sea. Its ability to dive hundreds of meters down, keep warm in icy waters, and run on land, can all be explained through its unique internal anatomy. They are joined by zookeeper and sea lion trainer Mae Betts, who adds insight into the intelligence of these sleek marine mammals.
Co-Presenters: Ben Garrod and Jess French
Producer: Ella Hubber
Editor: Martin Smith
Production co-ordinator: Jana Bennett-Holesworth

The tiny sap-sucking aphid, at just a few millimetres long, is the scourge of many gardeners and crop-growers worldwide, spreading astonishingly rapidly and inflicting huge damage as it seeks to outwit many host plants’ natural defences. With insights and guidance from aphid expert George Seddon-Roberts at the John Innes Centre, Norwich, some delicate dissecting tools, and a state of the art microscope, Prof Ben Garrod and Dr Jess French delve inside this herbivorous insect to unravel the anatomy and physiology that has secured its extraordinary reproductive success, whilst offering new clues as to how we could curtail its damaging impact in the future.
Co-Presenters: Ben Garrod and Jess French
Executive producer: Adrian Washbourne
Producer: Ella Hubber
Editor: Martin Smith
Production co-ordinator: Jana Bennett-Holesworth