Practical knowledge of a famous detective Conan.

People generally become stiff within 30 minutes to 2 hours after death, and will become stiff after 9- 12 hours. After 30 hours, it will continue to be stiff, then it will soften and return to its original state in about 70 hours. ※.

This is usually the case, but if the ambient temperature is higher than 35 degrees, the stiffness and softening will accelerate and recover after 24 hours. ※.

After strenuous exercise before death, protein will solidify easily in the body, and become stiff faster than usual after death. ※.

Suicide is when a gun is pointed at the head, which will leave hot marks around the bullet hole and the color of the surrounding skin will deepen. Besides, the hole the bullet enters is smaller than the hole it exits, and there is less blood flow. ※. Under normal circumstances, only suicide will leave burn marks.

If the lungs are perforated, even if you want to breathe, you can't breathe smoothly because the lungs can't expand, which will lead to suffocation and death. I can probably struggle to death, 10- 15 points. ※.

Drowning: slight water stains in the mouth, dilated pupils, bleeding on the mucous membrane of the eyes, and rupture of the eardrum due to water pressure, leading to bleeding. ※.

Poisoning: the lips turn purple or black first, and then other parts of the body will also appear this phenomenon. Sometimes eyes stare, hands clench fists, waist and legs curl up, etc. ※.

Choke to death: there is a deep purple imprint on the throat. When it hurts, the pupil expands and the tongue sometimes sticks out, showing purple-black. ※.

Cleaning the wound with tea to neutralize toxicity is the best way to deal with sea snake bites, because tannins contained in tea can detoxify. In addition, the person in charge of sucking out the poison should also gargle with tea to prevent poisoning. ※.

In case of food poisoning, mung beans can be ground and washed to temporarily remove toxicity. ※.

When salt is mixed with acidic detergent, it will produce toxic gas. ※.

The skin of the deceased was pink with some spots from the inside out, which was obviously caused by sodium hydroxide poisoning. If the poison be in the capsule. ※. It takes at least 15 minutes to show toxicity. It is best to gargle with something containing protein, such as milk.

Potassium cyanate is insoluble in cold water. ※.

The surgeon will leave a deep and obvious mark on his index finger, which is caused by frequent dressing. ※.

The hair of the deceased was slightly burnt and the muscles of the whole body were extremely stiff, which was the characteristic of high-voltage electric death. ※.

The scald caused by the current flowing into the body from the fingertips will turn the fingers gray. ※.

Eating potassium cyanate will suffocate and die (potassium cyanate has almond flavor). ※.

If you poison a flower, the flower itself should wither first. ※.

On the surface, it seems to be a "suicide" death by biting off the tongue, and sometimes it is a convulsion caused by inhaling poisonous gas or swallowing poison. ※.

There are many kinds of poisonous bacteria, some of which release poisonous toxins. Poisonous bacteria can also be used as medicine, but they are also poisonous, so you'd better not eat them. ※.

Carbon dioxide poisoning: the gas around people contains more than 20% carbon dioxide, so people will have severe convulsions after inhalation, and they will bite their tongues in a few seconds and die of cold. Carbon dioxide is heavier than air, so it will sink in a certain space. ※.

If the spasm is caused by massive bleeding, a rope must be tied around the wound to stop bleeding and prevent excessive bleeding. Next, massage your heart. ※.

If a person's internal organs are broken, there will be a special smell of internal organs. ※.

A big echo in the cave means there is no road, and a small echo means there is still a road. ※.

Sodium thiosulfate (bleach) can detoxify potassium hydroxide. ※.

The surface of pearl is composed of calcium carbonate, which is most afraid of acid corrosion. Therefore, when touching precious pearls, be sure to wear gloves or wrap them with handkerchiefs. If you don't use them, pearls will come into contact with oil stains on your hands, and the luster of pearls will disappear faster. The luster life of pearl surface is 30-40 years at most, and then it will fade slowly. ※.

When the corpse is buried in the soil, so that the corpse can't touch the air, the decomposition speed of the corpse will be normal 1/8, and it will be slower in water. ※.

Generally, people who have been missing for more than seven years will be confirmed dead, and those who have disappeared due to natural disasters or disasters will be confirmed dead for more than one year. ※.

Hitting a person's head with a blunt instrument may even cause a file tear. Usually, there will be no blood spilling from the first blow, but there will be scars around the wound. ※. Only when the second blow is in the same place will the blood come out.

Upper and lower lip mucosal bleeding, neck epidermis peeling, skin peeling bleeding, conjunctival bleeding, etc. Indicating strangulation. ※.

If the deceased was strangled and hit on the head with a blunt instrument, it would cause serious intracranial injury and respiratory failure and die. ※.

Eating a certain amount of sodium nitrite will also kill people. Only a small amount of toxicity enters the bone marrow in acute poisoning. ※.

DNA fingerprinting is highly individual-specific, which unifies the consistency between different tissues of an individual. Its repetition rate is one in a billion, which is similar all over the world. ※.