This statement is repeated so often that it has become somewhat of a cliche: 'billions of neutrinos pass through your body every second'. For example see 1, 2, 3, 4, 5, 6. What is the evidence for it, especially considering that we have never detected even a hundred neutrinos in a second through...

I just discovered in my parents' basement a Sprite can from 1995* and also a Coca-Cola can probably from the same year. Both cans are unopened and have no visible damage or holes. The Coca-Cola can feels "normal", but the Sprite can is empty! You can hear in my video that there is no liquid ...

When you play recorder or whistle, the pitch depends on how hard you blow into the tube. E.g. when you blow a whistle, initially the pitch is slightly lower when there is less air flow. This seems counter intuitive since the airflow should only affect the amplitude of the sound waves (like in man...

Consider two bodies in space exchanging heat solely by radiation. Let's call them a star and a planet. If the star contains a heat source and the planet doesn't, it can be shown that temperature of the planet can't get higher than that of the star. This sounds perfectly intuitive and is explain...

On page 157 of Schwartz's QFT book, He write that “$\sigma_i$ do not change under rotations”. If so, changes in $\psi$ and $B$ cancels, so we can get that $(\vec{\sigma} \cdot \vec B)\psi$ is rotationally invariant. But why Pauli matrices are the same in any frame? Any hint or reference would b...