Air pollution shuts schools in Iran's capital

Schools in Tehran were ordered to be closed on Wednesday after the Iranian capital was cloaked in dangerously high levels of air pollution, authorities said.

Confusion at the fish counter: How to eat fish responsibly

It now seems absurd that anyone once believed the ocean was inexhaustible: fish stocks are in dismal shape and scientists say overfishing is a global problem with potentially irreversible consequences to ecosystems and human ...

A licence to parent?

It's a comment we often hear in response to stories of child neglect: that parenting should require a licence.

Thanks to science, parasite can have sex in mice, not just cats

Toxoplasma gondii, a single-celled parasite perhaps best known for its ability to trick mice into taking potentially fatal risks around cats and, in humans, as a serious threat to fetal health, has given up a long-held secret ...

Stable housing in infancy nets lifelong benefits

Housing stability in the first thousand days of a child's development has a potential economic benefit of $3 billion annually, new research from PwC and the Strong Foundations collaboration has found.

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Pregnancy

Pregnancy (latin graviditas) is the carrying of one or more offspring, known as a fetus or embryo, inside the uterus of a female. In a pregnancy, there can be multiple gestations, as in the case of twins or triplets. Human pregnancy is the most studied of all mammalian pregnancies. Obstetrics is the surgical field that studies and cares for high risk pregnancy. Midwifery is the non-surgical field that cares for pregnancy and pregnant women.

Childbirth usually occurs about 38 weeks after conception; i.e., approximately 40 weeks from the last normal menstrual period (LNMP) in humans. The World Health Organization defines normal term for delivery as between 37 weeks and 42 weeks. The calculation of this date involves the assumption of a regular 28-day period.

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