Stefan Hienzsch's cleaning company folded in Germany's first lockdown. Luckily, he had other skills he could call on to grow another business. He's one of the lucky ones.

Bottled water is very big business. Water sommelier is a new kind of occupation. To practice it, one has to learn about all kinds of barely perceptible differences. We visited a training course.

Millions of people in the capital of the Philippines don’t have enough clean water. To improve things the government plans to build a dam to supply Manila with 600m liters of water a day. But it would uproot many people from their village homes.

What should water cost? Who should provide it? Is it morally acceptable for companies to profit from selling it to those who need it? Sophia Maria Schmidt, involved in the Students4Water project, discusses the issues. She says the price should rise.

It takes 8,000 liters to make a pair of jeans: we use a lot more water than we realise. Virtual water is a term for water used to make products. In effect, we even import water from drought-stricken regions in coffee or meat. What can we do about it?

Tesla's plan to build a huge new factory near Berlin has triggered a debate in Germany about protecting groundwater. In Delhi people have to queue for drinking water. Water parks are booming on Bali. Water scarcity is a global problem.

A strong tailwind is boosting renewable energy sources, and as wind turbines get taller and taller, their blades are getting longer and longer. We visit a wind farm under construction in Germany.

Daytrading has been booming during the pandemic. As lots of retail investors also join in, stock prices have been soaring. But in this very risky business it’s easy to lose big. Chelsey Dulaney tried out daytrading for herself.

In recent decades scientists and engineers have learned to make and manipulate nanoparticles and nanostructures and deploy them in products and processes. The range of applications is enormous and expanding fast.

Micro-homes mean very limited space, but more and more people are interested in downsizing their accommodation. We meet a tiny-house builder in Germany, and an architect in Hong Kong who says small homes are key to overcoming homelessness.