Last in the top ten list, where you probably noticed I didn't give away any places, so I could now say that the cork bark was my first place or that was my first place or somewhere in between. I would love to leave the review to you. Which of these is your first place in the top ten.

As a final aspect, here is a material. You can see it when you move it a bit, something happens, there is a liquid in this case incorporated into a double web plate, embedded. We had a pleasantly warm day today, so the side cut shows half of the material here liquid, the other half of the material, you can see it when I tip like that, but still solid.

This is so-called PCM, phase change material, which uses exactly this phase transformation from solid to liquid and the associated energy consumption and release to buffer very, very cleverly with, in a certain way, absolute low-tech climatic peaks.

In terms of application, it is now astonishing how much we are being promoted and taking care to allow as little energy as possible to escape from a building. As a result of the fact that we have made great progress here, there are now many buildings that consume significantly more energy in summer than actually in winter.

What is being done? Energy is needed again to cool the buildings accordingly. Here, such low-tech materials are an option, because if you imagine yourself taking your climatic peaks, we have in Germany, I think on average, seven extremely hot days, for which the air conditioning systems are often designed.

If you can cut these seven hot days and intercept this spike with these PCM materials by starting to melt this salt hydrate right here on these seven days, you have a significantly low-sized air conditioner that requires much less energy, saves you a lot of money and has done a big, big favor for the environment.

The last top ten material is that if I also have material here that I would bury in the garden, I have a material that you can also eat if necessary, I also have material here, I would neither bury it in the garden nor eat it. Nevertheless, it is certainly high voltage in many health aspects.

The top ten once again drew such a bow as to how diverse, how beautiful and large the variety of materials is here. The often heard with us, in my opinion, is a bad excuse that there are too few healthy materials I hope to have refuted and as I said, look for your personal number top ten materials.