Why is radiation green?
What color comes to mind when we talk about radioactive elements? Many people probably think of green. But the truth is that very few radioactive substances glow on their own: …
When people started eating cheese?
Cheese lovers may be pleased to learn that their favorite food is one of the oldest delicacies on the planet, which humans began consuming millennia ago. About 7,200 years ago, …
Previous universe traces
Among the many theories explaining the life cycle of our Universe, the “Conformal Cyclic Cosmology” is of particular interest. Its author is the famous physicist Roger Penrose, who is on …
How many photons are there?
Photons are elementary massless particles, quanta of electromagnetic radiation that we perceive as light. Many photons fall on the objects around us and are reflected into the retina of our …