Why do we see the blue veins if the blood is red?

We see the superficial veins of bluish color due to an optical effect produced by the skin. 

In this sense, the veins only appear blue when they are located approximately 0.5 millimeters below the epidermis. 

This is because the white light that forms with all the colors of the spectrum penetrates to this depth and makes us perceive the color of the veins as blue.

In this way, the thinner the skin and the less subcutaneous fat, the more bluish the veins become transparent through the skin.

The blood that runs through the veins is more bluish than the one that runs through the arteries, since it contains less oxygen, having exchanged it in the capillaries. 

The veins return this blood to the heart, which will pass it through the lungs to re-oxygenate it.

Formerly, the nobility was called blue blood, because by not working in the sun like the peasants, that color was better distinguished.

Why does your brain need to listen music?

A few months ago, a Canadian research was able to "photograph" what was happening in our brain when we listened to songs. The images obtained by magnetic resonance showed the scientists how music exerted a real pleasurable effect on our mind.

In particular, the place in the brain responsible for feeling that pleasant sensation so characteristic when we listen to songs is called nucleus accumbens. Valorie Salimpoor's group published their results in the journal Science, and thanks to their work they concluded that music represented an "authentic intellectual reward" for our brain.

The pleasure we feel with the music is due to the release of dopamine in this region of the brain. This neurotransmitter is produced from neurons of the ventral tegmental area to structures such as the nucleus accumbens (among others), where it acts mediating a "reinforcement mechanism"

Listening to music allows us to be more effective songs allows us to be more effective in our work.

A study published in the journal Neuroscience and behavioral physiology in 1999 indicated that listening to songs could allow us to work faster, so this can be translated as music working faster makes us more effective .