What is the resolution of the human eye? Answers to amazing questions!

What is the resolution of the human eye in megapixels? Reliable and accurate estimates cannot be given because of the fundamentally different device structure of our vision apparatus and digital cameras. However, Roger Clark, an expert in photography, a researcher at the American Planetological Institute, carried out rough estimates of the resolution of the eye, receiving an impressive figure of 576 megapixels. He also indicated the photosensitivity of the retina - about 800 ISO.

How do spacecraft fly through the asteroid belt and not collide with them?

The expression "asteroid belt" is quite arbitrary: the orbits of its constituent bodies are located in a very wide space with a radius of 2.1 to 3.3 astronomical units. And although the total number of asteroids with a diameter of more than a meter in it is estimated at 800 trillion, they are distributed over the volume of tens of trillions of trillion cubic kilometers. Even large objects of the belt collide rarely with each other - bodies 10 km or more collide once every 10 million years. So, in fact, the ballistics, on the contrary, have to make great efforts to ensure that the trajectories of their missions pass near the desired asteroid. It is almost impossible to meet with them by chance.

Why does turning on WiFi improve GPS positioning accuracy? Modern navigation programs use huge databases with information on open WiFi networks. It is not necessary to enter the wireless network: the signal strength allows you to estimate the distance to known access points and to clarify the current GPS readings.

Is it true that LED lamps do not attract insects? Attract, albeit noticeably less. British researchers Gareth Jones, Stephen Harris and their colleagues have verified this by experimenting with incandescent lamps, fluorescent lights and LEDs. After a night of exposure, about four times less insects accumulated in the traps installed in LED lamps than in incandescent lamps, and half as much as in fluorescent ones. Moreover, for the biting Culicoides, representatives of the midges, this difference was even more pronounced: 80% of them flew to the incandescent lamp, and only 5% to the LEDs.

Why are cats so attracted to laser light?

The movements of the light spot from the laser beam “trigger” the hunting behavior in cats, resembling the flickering movements of a potential victim, a small rodent. The less the cats have the ability to satisfy this craving in the usual ways, the easier they are excited by such “extraneous” stimuli. I must say that the cats themselves practically do not distinguish shades of red: according to John Bradshaw, a professor of veterinary medicine from the University of Bristol, the spot for them looks more like white and yellow, closer to the natural color of rodents. But large animals from the cat family practically do not react to the laser spot - apparently, it seems to be insufficient for their victims.

Did the day always last 24 hours? Today, the day lasts almost exactly 24 hours, because it is during this time that the Earth makes a complete revolution around its axis. In the past, the rotation speed of our planet was higher, and the day on it lasted less. Another 1.3 billion years ago, they lasted some 15 hours, so that almost 600 days had passed in a year. By the Jurassic period (about 200 million years ago), the day reached 22.7 hours, which is equivalent to 386 days a year, and only a couple of million years ago they became familiar to us 24-hour.

What is the difference between white and brown chicken eggs?

Only in color: neither white nor brown eggs differ in taste, nor in composition, nor in shell thickness. As a rule, chickens with white feathers carry white eggs, and brown - brown, although this is not always the case. A more reliable indicator is the color of the fluff near the ear of the bird, although this is not always true. You may notice that colored chicken breeds are usually larger than white ones, eat more and carry larger eggs, which partly explains their higher cost. As for their particular benefit or taste, this is simply a myth that they successfully use when selling brown eggs are much more expensive than white ones. Buyers are sure that they paid extra, having received a more “healthy” product, and everyone is satisfied.

What do the colored rectangles on the tubes of toothpaste mean? Tales that the color of the rectangle indicates the quality or composition of the cream or paste inside the tube is a well-known urban legend. Such contrasting color marks are applied during production and help the automated packaging line sensors more accurately position the tubes for cutting, folding or gluing.

How do fabric softeners work? Such means really make the fabric softer - they include substances that facilitate its sliding and increase the mobility of electrostatic charges. As a rule, softener molecules contain long “tails” converging on a charge-carrying “head”. With positively charged ends they hold firmly in place (like hair, tissues in the wet state are slightly negatively charged), “exposing” their chains, in which a little moisture can accumulate. Water conducts electricity and even in amounts invisible to the touch allows charges to quickly leave the fabric without accumulating in such quantities as to “bite”.

The article “Questions and Answers” ​​was published in the journal Popular Mechanics (No. 4, April 2017).

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