caldera, what is caldera, guys, caldera in spanish means cauldron and is a bowl-shaped basin, that isano, after that great and powerful of.. the volcano is actually active, it is simply is dormant, and geologists say that for a volcano to be considered extinct or inactive, 3,500 years must have passed since its last eruption, it will still be active for a long time, and why is the water so hot, the fact is that in the crater lake, on the shore where we are now, there are several thermal springs, it is medicinal, no, it is not medicinal, it is just pleasant, it just gives some kind of relaxation. this is the pumice stone that is familiar to us all, we are rubbing the heels, which, yes, guys, we advise our guests, so to speak, to collect small pieces of pumice, everything is correct, you noted, the fact is that pumice is a product of the vital activity of a volcano, depending on how much water is in the magma that pours into the atmosphere, the formation of certain eruption products depends, accordingly, the water simply foams ... magma at the moment of its eruption. one more flight for

picture was taken from the iss at an altitude of 400 km, experts took a closer look, this is the calderal, poor yorkie, poor yorkie, you need to keep your eyes open, completely restore the cornea and retina of the eye, after any illness, it will soon be possible, thanks to the latest scientific achievements of russian biologists. the eye can be compared to a camera, the retina is a matrix, and the front lens of the lens is the cornea, if damage appears here , it will affect the image, it will become blurry, the same with the organs of vision, if the cornea becomes cloudy, a person begins to see the world as if through foggy glass, and over time may even lose vision completely. an effective treatment method is transplantation of a donor cornea, but a maximum of 4,000 such operations are performed in russia per year. the need for them is much greater, but there is not enough material for transplantation. novosibirsk scientists and ophthalmologists seem to have found a solution to the problem. they proposed using so-called ocular stroma cells. which are normally responsible for restoration