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Ten years ago, researchers succeeded in suppressing sound wave propagation in the backward direction; however, this also attenuated the waves traveling forwards.

A team of researchers at ETH Zurich led by Nicolas Noiray, professor for Combustion, Acoustics and Flow Physics, in collaboration with Romain Fleury at EPFL, has now developed a method for preventing sound waves from traveling backward without deteriorating their propagation in the forward direction.

In the future, this method, which has recently been published in Nature Communications, could also be applied to electromagnetic waves.

1 or 2? Is Roger Penrose’s theory of three worlds the result of Penrose’s understanding of the physical world? 1. understands it correctly or 2. misunderstands it? — You can find explanations e.g. under the following link:


Es gibt praktische Fragen, die mit unseren konkreten Leben zu tun haben, und theoretische Fragen, die damit scheinbar nichts zu tun haben. Es gibt aber auch theoretische Überlegungen, die durchaus mit unserem praktischen Alltag zu tun haben. Eine davon ist die Drei-Welten-Theorie, die sich damit beschäftigt, in welchen Welten wir konkret leben.

About the Episode

What if it were possible to generate tissues and cells that replicate the functions of human organs, and then use them to study and treat human conditions?

It’s an area of research Dr. Thomas Hartung has been extensively involved with for decades. As the former head of the European Commission Center, he was in tune with all the ways researchers tried to study diseases through alternative methods. He strongly believes organoids have the intelligence necessary to accelerate research and therapeutic development without the need for animal models.