From submariners who live on an 18-hour day to the railway clerk who fought to standardise time zones, Steven Johnson discovers the surprising journey of time in our lives. Show more

For at least 100,000 years, humans have been able to make fire, but the skill to make cold is a modern technique. Steven Johnson traces the unsung heroes of this technology. Show more

Documentary series. A look at the unsung heroes who allowed us to transport our voices over long distances - one of the greatest transformations in how we live our lives. Show more

Documentary series. Steven Johnson discovers the unsung heroes of invention in the surprising journey from the candle to the neon lights of Las Vegas and the world of lasers. Show more

Coverage from the World Aquatics Championships in Budapest, Hungary, including the men's 4x200m freestyle relay and the women's 100m freestyle. Show more

Helen Skelton presents coverage of day five at the 2017 World Aquatics Championships in Budapest, Hungary.

Coverage from the World Aquatics Championships in Budapest, Hungary. Featuring the final of the women's 800m freestyle and the final of the men's 4x100m freestyle relay. Show more

Live coverage from the final day of the World Aquatics Championships. Medals in eight races are decided, including the men's 400m individual medley. Show more

Highlights from the diving finals at the World Aquatics Championships. GB's Jack Laugher and Chris Mears are the reigning Olympic champions in the men's synchro 3m springboard. Show more

Coverage from the World Aquatics Championships in Budapest, Hungary, including the women's 400m freestyle and the men's and women's 4x100m freestyle relays. Show more

Coverage of the World Aquatics Championships in Hungary, including the men's 100m breaststroke, women's 200m individual medley and the men's 50m and women's 100m butterfly finals. Show more

Coverage of the World Aquatics Championships in Hungary, including the men's 200m freestyle, the women's 1,500m freestyle and the women's 100m backstroke. Show more

Coverage from the World Aquatics Championships. The retirement of the legendary Michael Phelps means the men's 200m butterfly is wide open. Show more

Matt Baker introduces the best of the action from the women's team final at the World Gymnastics Championships. Commentary comes from Mitch Fenner and Christine Still. Show more

Matt Baker introduces action from the World Gymnastics Championships at the Tokyo Metropolitan Gymnasium in Japan, including the fiercely-contested men's team final. Show more

Matt Baker introduces the best of the action from the Gymnastics World Championships in Japan. Commentary comes from Mitch Fenner and Christine Still. Show more

Matt Baker introduces action from the Men's All-Around final from the Gymnastics World Championships in Toyko. Show more

Matt Baker introduces live coverage from Tokyo as a host of medals are decided in the men's and women's apparatus events. Show more

Matt Baker introduces live action from the final day in Tokyo as more individual titles are decided. Among them are the women's floor, won by Great Britain's Beth Tweddle in 2009. Show more

Gabby Logan presents coverage from the World Swimming Championships in Barcelona with Mark Foster, Rebecca Adlington and Sharron Davies in the studio. Show more