It’s strategy so far has been a clever one: staying out of the way of the bigger deliver startups such as Deliveroo (which has raised $1.5bn compared €160m for Wolt) and focusing on smaller cities and less developed markets.

It’s concentrated largely in the corridor running south from Helsinki through Estonia to the Czech Republic, Greece and Israel. Wolt is happy to enter a smaller city or 30,000 to 40,000 where many delivery companies are focused on those with more than 1m people, saying that they can still make the economics work.

The company has some big backers such as Iconiq Capital in the US and London-based venture capital fund EQT Ventures.

The nagging worry though is what the impact will be of the larger delivery companies pushing into smaller cities (as Deliveroo are already starting to do in the UK). Wolt could easily find itself an acquisition target for a bigger rival wanting to scale up in a whole new type of market.

Solar Foods uses electricity to split water cells to produce hydrogen. It then adds carbon dioxide and nutrients such as potassium, sodium, and phosphorus, and feeds this into microbes derived from the soil to produce food.

The process results in cells that are 50% protein, with the rest carbohydrate and fat. The idea, while still being trialled, is that it will create a food source that is not dependent on weather, irrigation or soil.

The company, founded by Juha-Pekka Pitkänen and Pasi Vainikka has teamed up with the European Space Agency to develop a system for producing proteins for space flights to Mars.

While it still a very early stage company, this could be the future of food.

The data retrieved is extremely simple compared, for example, to a customer questionnaire, but it gives companies huge volumes of data about how customers feel about their services at different points in the day.

The colourful smiley faces can now be seen next to exits in shops and supermarkets, airport controls and state hospitals. The UK airport Heathrow, the Swedish supermarket chain Coop, the American doughnut company Krispy Kreme, the UK’s national health service (NHS) and even digital giants such as Netflix and Amazon are among the company’s 4,000 customers, spread across 135 countries.

The company is now investing heavily in the data side of the business. Last year founder Heikki Väänänen told Sifted: “This is not a hardware business at all. We have about 1,000 features on the data collection side of the business so we are more about the data and how to analyse it and use it than anything else.”