Is there a drone lighter than a paper clip?
Seeing its cute flapping wings, it really looks like Doraemon’s bamboo dragonfly! This drone is called RoboBee X-Wing, with a bee-like design. It has a wingspan of 3.5 cm and a height of 6.5 cm. The power system and the machine itself are only 259 mg, which is even lighter than a paper clip. This is by far the lightest wirelessly flying insect-level aircraft that can collect images and data from natural disasters, crop diseases, and even war zones.
Have you heard of water poisoning?
Water intoxication is a poisoning symptom of dilutional hyponatremia caused by the human body ingesting excessive amounts of water in a short period of time. Simply put, the concentration of sodium in the plasma is too low. Sodium is very important in the human body. It can maintain water balance in the body and help neuromuscular movement. Too low or too high sodium ions in the blood can cause human discomfort. For example, when the concentration of sodium ions in the blood is too low, symptoms such as mild fatigue, headache, vomiting, etc. may occur, and even breathing difficulties may cause death. danger.
When people sweat a lot, they not only lose water but also salt. If you drink a lot of water at a time without adding salt, it will cause chronic water intoxication. Marathon enthusiasts, continuously fierce athletes, and training soldiers are among the high-risk groups of water poisoning. Therefore, after a lot of sweating, do not rush to drink a lot of water. After a short rest, add a small amount of salt water, and then gradually return to normal drinking.
Is there an optimal time frame for decision-making?
What time of day do you think is the best time to make a decision, morning or evening? Not necessarily, it depends on whether you want to make a quick decision or make an accurate decision.
Researchers studied the decision-making behavior of 184 chess players to find out what time of day players can make the best decisions. It turns out that the decisions made between 8 am and 1 pm are the most accurate, but these decisions take the longest time; decisions made in the afternoon are faster, but the accuracy will be lower. From this point of view, it is more reliable to make important decisions in the morning as much as possible.
Why do moths fight the fire?
Scientists discovered that when moths fly at night, they rely on moonlight to determine the direction, and always let the moonlight project into their eyes from one direction. As long as the moth maintains a fixed angle to the moon, it can make itself fly in a certain direction. This is the “celestial navigation” system of the moth. The flying moth saw the light of the fire and mistakenly thought it was moonlight, so it used this fake moonlight to discern the direction. The fire is very close to the moth, and the moth instinctively keeps itself at a fixed angle to the light source, so it can only revolve around the fire. Because its two eyes are at different distances from the light source, one eye feels stronger light than the other, so they keep turning in the direction of stronger light. Therefore, they always circle around, gradually approaching the fire source, and finally cause moths to fight the fire.
Why do seeds “dormant”?
Everyone knows that seeds can germinate under conditions of suitable temperature and moisture. Some seeds that do not germinate are due to lack of vitality, empty seeds (no embryos) or damaged embryos. In fact, seeds with vitality also have suitable germination conditions but do not germinate, which is called “dormancy” of seeds. For example, the hard seeds of the leguminous family are called “raw beans” or “dumb crotons”. This is a type of seed dormancy-physical dormancy, which is mainly caused by the seed coat preventing water absorption. It also includes morphological dormancy (the embryo is not fully developed), morphophysiological dormancy (the embryo is not fully developed and has physiological dormancy) and compound dormancy (the seed coat is impermeable and the embryo has physiological dormancy). In fact, dormancy is not a “temper tantrum”. Some dormant seeds are deliberately arranged by clever plant mothers, and some clever seed babies perceive that the external environment is not conducive to growth. The dormant seeds will wait for the right time to germinate, so as not to encounter adverse conditions and cause the extinction of the population.
Why are there lumps on the body of Lep Ha Mo?
The scientific name of the toad is toad. It is a close relative of the frog. Its mouth is wide and big, and it is as good at catching pests as a frog. But it has ugly lumps on its body, which makes people feel sick. In fact, it grows like this to protect itself. When it is lying on the ground, the color of its skin is very similar to the color of the soil, so that it can avoid being spotted by enemies. The lumps on the leper’s body can secrete mucus to keep the skin moist; some lumps can also secrete milky white serum, which is poisonous and is a weapon for attacking enemies. There is a gland behind the ear of the leper hama that can secrete toad venom, which can be processed into traditional Chinese medicine, which has the effects of hemostasis, analgesia, heart strengthening, and detoxification.
What would you look like without bones?
If you don’t have bones, you might be able to stretch your arms like a rubber band, or you can flatten yourself through the cracks in the door, or deform like Harry Potter’s deformers!
But there will be undesirable consequences. Under the action of gravity, it may be difficult for your body to maintain its proper shape. In most cases, whatever utensil you lie on, you become the shape of any utensil, whether it is a box or a bowl. It’s like water in a cup or jelly in a mold. If nothing is holding you, you may look like a big trembling jelly that has just been spilled on the floor.
Bones give you contours and provide an internal framework to help you stay in shape. It provides a surface for muscles to climb on, and it also constitutes joints, which are organs like pulleys and levers. Without the hard parts to force the muscles and without the mechanical advantages provided by the joints, you will become very weak and tired because you have to use more energy to move your arms and legs.
If you choose to live in water, you will be close to weightlessness, so you will not feel particularly tired when moving. You might look like a jellyfish, squid, or octopus.