(via Sabine Hossenfelder) Is the universe really infinite? Or could it close back on itself like a sphere? If it’s infinite, how can it expand? And is it true that there might be copies of you in it?

(via Sabine Hossenfelder) Progress in the foundations of physics is moving slowly. And yet it moves. Today I look at the five biggest problems in physics, what their status is, and how long it will ...

Is there anything after death? What is the meaning of life? Are we just a bag of atoms? The scientist Sabine Hossenfelder, born in Frankfurt (Germany) 48 years ago, is convinced that if there is a ...