Obstetrics & gynaecology

Drinking alcohol is linked to reduced chances of pregnancy

A study of the associations between drinking alcohol and the chances of becoming pregnant suggests that women who want to conceive should avoid heavy drinking. In the second half of menstrual cycle even moderate drinking ...

Medical research

Stem cells show gender differences in COVID-19 risk

With more than 125 million people infected and nearly 3 million dead, the COVID-19 pandemic has disrupted the world in inconceivable ways. Adding to the challenge is that the patient condition varies widely, from the asymptomatic ...

Diseases, Conditions, Syndromes

Opinion: Yes, we can prevent future pandemics

As we hopefully soon will start seeing the results of the efforts against COVID-19, we must simultaneously prepare for new and potentially more serious pandemics. Preventing new pandemics is definitely a common global challenge.

Medical research

Phase 1 clinical trial of unique COVID-19 vaccine begins

A unique vaccine to protect against COVID-19 begins clinical testing Tuesday, 6 April, at the Walter Reed Army Institute of Research (WRAIR), part of the U.S. Army Medical Research and Development Command. Scientists developed ...

Diseases, Conditions, Syndromes

Tracking how COVID-19 is changing life expectancy

As a demographer—someone who studies how human populations grow and change—UCLA professor of sociology Patrick Heuveline typically spends time each year traveling around the world, talking to people about their hopes ...

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World population

The term world population commonly refers to the total number of living humans on Earth at a given time. As of 29 July 2009, the Earth's population is estimated by the United States Census Bureau to be 6.774 billion. The world population has been growing continuously since the end of the Black Death around 1400. There were also short term falls at other times due to plague, for example in the mid 17th century (see graph). The fastest rates of world population growth (above 1.8%) were seen briefly during the 1950s then for a longer period during the 1960s and 1970s (see graph). According to population projections, world population will continue to grow until around 2050. The 2008 rate of growth has almost halved since its peak of 2.2% per year, which was reached in 1963. World births have levelled off at about 134-million-per-year, since their peak at 163-million in the late 1990s, and are expected to remain constant. However, deaths are only around 57 million per year, and are expected to increase to 90 million by the year 2050. Since births outnumber deaths, the world's population is expected to reach about 9 billion by the year 2040.

This text uses material from Wikipedia, licensed under CC BY-SA