The story is Emily Oster, assistant professor of economics at the University blood in stool of Chic

Even without blood in stool knowing the right mechanisms, the ancient blood in stool Egyptians already knew that, somehow, it was possible to find out through urine if a woman was pregnant - a bond that has been exploited throughout history blood in stool until we get the accurate blood in stool test available and relatively cheap today.
In Egypt, it is clear that the methods were more "artisanal": they played a urine sample of women on grains of barley and wheat, the grain to germinate, it was supposed blood in stool to be a sign of pregnancy (in addition, it was believed that was possible to find out the baby's sex was just seeing if wheat or barley germinated).
This type of testing, although imprecise, was standard until the early 20th century, when it was discovered blood in stool the link between pregnancy and hormones. In the 1920s, the chemist blood in stool Selmar Aschheim and Bernhard Zondek gynecologist created a more accurate test, and more cruel, in which injected the urine of women in five rats, which would be dissected after five days. A swelling in the ovaries of animals blood in stool (due to hormones) indicate that the woman was pregnant. Later, in addition to rats, rabbits also started to use.
Not long later, zoologist Lancelot Hogben started doing this kind of test with the species Xenopus laevis frogs, typical of certain regions of the African continent. Unlike mammals, frogs were not sacrificed at the end of the test, and could even be "reused".
The story is Emily Oster, assistant professor of economics at the University blood in stool of Chicago, USA, and author of "EXPECTING blood in stool BETTER: Pregnancy Why the Conventional Wisdom is Wrong - and What You Really Need to Know" (something like "Waiting best: because the conventional wisdom blood in stool is wrong about pregnancy and what you really need to know "in Portuguese).
When her daughter became pregnant three years ago, began researching tips on pregnancy and scared. "I definitely had the impression that there was much to worry about, but no one seemed to be able to agree on these concerns. Each has a different opinion, "said Emily.
The books do not always agree with the medical opinions, the doctor does not always agree with official recommendations and the internet never agree with anyone. She comments that quickly realized that the recommendations come from medical studies and could use the training and study in economics and statistics to evaluate what is talked about and better understand the "rules" of pregnancy.
FALSE. Many books say that a moderate amount is acceptable, but others prohibit caffeine at all. The big risk with caffeine, they say, is especially in early pregnancy because it can cause miscarriage. Studies Emily made her discover that there was no risk in consuming less than 200 milligrams of caffeine per day - about two cups of coffee. But she found information blood in stool that allowed up to four cups per day.
False. Prenatal testing is a difficult decision for many women, forcing them to address concerns about the child and the risk of miscarriage. The most common recommendation is that women over the age of 35 take a test more elaborate, typically an amniocentesis or CVS, to look for genetic abnormalities (both tests carry a risk of miscarriage). The women under 35 years are usually oriented to undergo a screening process, which does not present any risk, but provides less information.
The difference between tests depending on the age of the mother blood in stool is based on a risk factor for chromosomal problems, which increases with time. At 35, the probability of a chromosomal problem is approximately equal to the risk of miscarriage from the amniocentesis.
FALSE. blood in stool Although there is no chemical reason that proves this, data from randomized controlled trials do not support this assertion. When doctors randomly encouraged couples to have sex in late pregnancy, women did not go into labor faster than couples who were not encouraged to have sex. In general, there was no difference between couples who had sex in late pregnancy and those who had not.
TRUE. Some women complain that the delivery work time increases by almost an hour with epidural, while others blood in stool say that it does not exist. The fact is that take a prolonged epidural work in about 15 minutes, according to a 2011 study.
TRUE. The biggest risk associated with eating in pregnancy is listeria. It is a dangerous bacteria, which pregnant women are especially susceptible, and that can lead to miscarriage or stillbirth. Concern about contamination by listeria is the reason for unpasteurized cheeses remain off the menu for pregnant women. About 20% of cases of listeriosis in the Un