#Cool Summer Life #Pregnancy is very important for passing on the generations. Therefore, the method of testing whether to get pregnant is extremely critical, and human beings have continuously improved and pursued the method of pregnancy testing for thousands of years to achieve today's convenience and accuracy. In the meantime, a great deal of money has been paid, and many species have even become extinct or nearly extinct.
Ancient Chinese medicine likes to take the pulse, and according to the pulse phase, it is known whether it is pregnant or not. The ancient Egyptians poured pregnant women's urine on the grains of wheat, which, if germinated, meant pregnancy. The accuracy of these two methods is quite high, but it does not reach more than 90% accuracy.
It wasn't until after the enlightenment began that science was popularized and technology developed. People use scientific means to continuously explore the method of pregnancy testing, so that the accuracy of pregnancy testing continues to improve, but various species have suffered.
First mice, because the hormones in the urine of pregnant women can precociously mature and congest the ovaries of mice. But each pregnancy test requires the dissection of 5 mice, which is too expensive. So later changed the little white rabbit, but the little white rabbit also has to die, although only one is killed at a time, but a small clinic also has to kill thousands of small white rabbits a year.
How does this work? Pregnancy is a happy event but it is going to kill, and it is unlucky and immoral. A better approach is needed.
Later, scientists found that experiments with African clawed frogs did not require killing, but only injected them with hormones to see if they laid eggs. I thought this method was good, convenient and economical, who knows that many species have become extinct or almost extinct.
After the African clawed frog was used for pregnancy tests, they left their african homeland and spread all over the world, becoming an invasive alien species, and the local ecology was seriously damaged. More seriously, the African clawed frog carries the frog chytrid fungus, which is symbiotic with the African clawed frog, but for other frogs and amphibians it is the plague god. Frogs and amphibians infected with Chlorella will die on a large scale, some becoming endangered species, and some directly perishing.
According to statistics, more than 500 species have been affected, of which 90 are completely extinct and more than 100 are close to endangerment. Think about how serious the consequences are.