QUESTIONS TO SCIENTISTS
IS IT THE TRUTH THAT DOGS ARE COLOR BLIND?
We cannot imagine how exactly the dog sees. We also cannot say for sure whether a dog has a notion of color which is similar to humans. But scientists do some assumptions which are based on the examinations of the dog’s eye structure. The structure of the eye tells us that the dog most likely perceives only the brightness of the source but does not see its “color”: after all, the retina of the dog’s eye is equipped with receptors of only one kind – rod-shaped cells, and “color vision” requires two kinds at least.
If you watch the dogs, you will notice that they generally have poor eyesight due to bad eye’s structure. They navigate mostly by hearing and smell, they distinguish only fuzzy contours visually.
WHY IS IT SO EASY TO BREAK THE GLASS?
Glass has a very complex structure. They consist of large groups of different molecules, which are normally very strongly connected to each other. That is why glass is hard (not soft).
But if you separate two of such groups, and then put them back to each other, then it matters with “which side” they are connecting to have a strong bond.
If a tiny crack appeared when the glass was bending, its edges are trying to connect, but the molecules approach each other in the wrong way, and no strong bond is formed. The crack instantly expands and becomes large. Because of this, the whole glass breaks into pieces.
WHY HAIR CAN’T BE BLUE?
There are two dyes (pigments?) in the hair, which are synthesized based on the natural pigment melanin (from the Greek “Melas”, Genitive – “Melanos”. “black”): eumelanin (black or brown) and pheomelanin (yellow or red). Besides, there are microscopic air bubbles in the hair. The resulting hair color depends on the ratio of these pigments and the number of air bubbles. The blue color cannot appear from this combination. Neither does the green one.
WHY A SPIDER DOES NOT STICK TO ITS SPIDERWEB?
This happens because the spider always runs only along smooth radial strands (which are running from the center), and never on sticky, concentric strands (circular). The locates the victim by the stretched strand. By the way, the web is as light as it is durable. If you tie a web strand around the circumference of the Earth once, then its weight would be only 450 grams.
Artworks: Asya Leushkanova