Chest Cold Tight Chest

Why sea water is salty?

if there is a question which is asked by a child 8 years, point blank, it could also leave you dry answers. Armed with curiosity, as always, I realized that I had not even me the basics in order to respond, and then, I am looking for explanations.
The explanation, in fact, has deep roots: with the passing of geological time, in fact, the rivers flowing into the oceans, carrying with them the minerals in the soil, and that, over time, has altered the original chemical composition. Of course, while the water of the river continues to deliver and deposit salts with which it was subtracted from the rocks in contact, these salts were going to increase even more in the sea.
The salt concentration in marine waters at the moment is about 35 grams per kilogram of water, a value that has remained virtually unchanged in the last billion years. However, salinity varies depending on the depth of the sea, rising to the surface, exactly where the greatest evaporation occurs. Where the amount of water sweet rivers has increased, the salinity is less sure.

Dog Has Flaky Black Dots

Why is yawning contagious?

Admit it: how many times have you found to blame the start of your mistake prolungatosi for a while 'minutes, someone at your side who started before you? If
for many, yawn so far has meant a synonym for boredom, hunger, indigestion, fatigue, well prepared to think again. Undoubtedly, these could be very good reasons, but there is another much more frequent and justified: the yawning, in fact, represents the response of our body to self lack of oxygen and therefore, the body tries to breathe through "unusual" as precisely the wrong, to compensate for this deficit, by expanding the pulmonary alveoli.
If we are, therefore, in the company of others and comes to us from yawning, the reasons may be manifold: either it's time for lunch or dinner, and then we have a little 'all hungry, or it is evening and then coming up general fatigue, or, as in most cases, we are short of oxygen at the same time.

Avg Cost Of Hair Colored At Salon

Why the Chinese have almond-shaped eyes?

The Chinese, but in general all East, have one visible body, which distinguishes them from Western's almond eyes. But why?
This feature, in fact, has been inherited long ago from their ancestors who lived in cold Siberia, exactly 25,000 years ago. They too had almond eyes, changes occurred to a real need to defend the eye from intense cold, wind and sunlight reflected from snow.

source: focusjunior.it