Ch4

The Aztecs ruled one of the most powerful empires in history. Lost Pyramids of the Aztecs is an immersive investigation into the vanished world of this remarkable civilisation.

Sahar Zand reports on the adverse impact of locusts across Kenya and neighbouring countries, which are devouring crops and threatening millions with starvation. Filmed before the UK went into lockdown, she visits Kenya, on the trail of immense swarms of the insects - the biggest for 70 years. In a country in which agriculture provides a livelihood for more than 80 per cent of the population and where over a million people live on the edge of hunger, even a small swarm can eat the same amount of food in a day as 35,000 people, threatening millions with starvation and economic collapse.

As the country prepares for the easing of lockdown, this documentary tells the stories of the elderly and vulnerable people self-isolating during the coronavirus crisis, for whom lockdown may continue for many more months. Featuring people from all over the nation and filmed on location, their stories convey the immense challenge of being especially vulnerable in the midst of a pandemic. Suzanne, who has terminal cancer, has come up with a novel approach to seeing her friends, while Desmond has been forced to move in with his daughter and granddaughter to avoid the virus, which has already taken the lives of at least four of his friends.

Helen Skelton investigates Britain's sandwich industry, including shocking hygiene at a major sandwich chain, unreliable nutritional advice, and dirty conditions at major production plants

Adnan Sarwar follows the trail of migrants dicing with death as they attempt to cross the frozen Alpine peaks marking the border between Italy and France. Braving altitudes of up to 2,500 metres and temperatures as low as minus 20, many have died in their attempt to seek safety, having been denied asylum in Italy or threatened with deportation back to the countries from which they fled.

After a tense and chaotic US election campaign, Dispatches looks at what's next for America. How can the divided country recover? And what will the US look like once the dust has settled?

Sabrina Grant and Helen Skelton investigate how the online retailer's dominant position in the marketplace and wealth of consumer information forces other companies to adapt their retail strategy to keep up. The programme also reveals how Amazon is rapidly replacing Google as the biggest gateway to the Internet and examines the company's plans to enter the grocery trade.

Kirstie Allsopp helps us craft our way to a joyful festive season with her fastest, most magical makes. Simple, fun, affordable and achievable in less than 45 minutes, this is Christmas craft for all.

Britain's service industry is battling for customers, but the public need to be convinced the big names are doing all they can to limit risk to exposure. Many hotel chains, transport companies, restaurants and pubs are making big promises of `deep cleans' and ``enhanced hygiene practices', but with the resurgence of Covid-19, Morland Sanders puts them to test and asks just how safe is it when we go out. Government public health guidance says regular cleaning of surfaces plays a vital role in limiting the transmission of Covid-19 in public settings. In a national experiment, the programme tests the cleanliness of the surfaces people might encounter on a commute, or going for a drink, a meal or a mini staycation?

A taboo-busting look at how Afro-textured hair shapes Black experience in modern Britain, as writer Emma Dabiri talks to men and women about their hair stories.