Good news for gray whales: 'Unusual mortality event' declared over
It was a worrisome few years for North Pacific gray whales, with hundreds washing up dead on shorelines along the West Coast leading to an estimated 30% decline in their population.
It was a worrisome few years for North Pacific gray whales, with hundreds washing up dead on shorelines along the West Coast leading to an estimated 30% decline in their population.
Plants & Animals
Mar 18, 2024
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Social attitudes toward dating may be a factor driving interest in polyamory, but economic forces could also be playing a role, says Mindy Marks, associate professor of economics at Northeastern University.
Social Sciences
Mar 18, 2024
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The 2022 baby formula crisis highlighted the precarious balance between regulation, competition and safety, according to a recent study published last month.
Economics & Business
Feb 22, 2024
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5
China has announced that in 2023 its population declined from 1.4118 to 1.4097 billion people. Forecasting by the UN suggests China's population will dip to 1.313 billion by 2050 and then down to about 800 million by 2100. ...
Economics & Business
Feb 13, 2024
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5
The number of babies born in England and Wales in 2022 fell by 3.1% compared to the previous year. The average age of parents is also at a record high, as people choose to delay having children. The average age of mothers ...
Social Sciences
Feb 13, 2024
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China's population has shrunk for the second year in a row.
Social Sciences
Jan 18, 2024
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1
Scientists in China on Tuesday announced that they have cloned the first healthy rhesus monkey, a two-year-old named Retro, by tweaking the process that created Dolly the sheep.
Biotechnology
Jan 16, 2024
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196
A trio of environmental engineers at the University of Illinois Chicago, has used census data and an annual demographics survey to make predictions about U.S. city population growth or decline in the years leading up to 2100.
A University of Michigan-led study based on a review of genetic and health information from more than 276,000 people finds strong support for a decades-old evolutionary theory that sought to explain aging and senescence.
Evolution
Dec 8, 2023
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260
Before having our first baby last year, we wondered whether we had the money, time and necessary skills to raise a child. Perhaps you find yourself contemplating the same? Many people certainly have, as birth rates have been ...
Social Sciences
Dec 1, 2023
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10
Crude birth rate is the nativity or childbirths per 1,000 people per year.
It can be represented by number of childbirths in that year, and p is the current population. This figure is combined with the crude death rate to produce the rate of natural population growth (natural in that it does not take into account net migration).
As of 2007[update], the average birth rate for the whole world is 20.3 per year per 1000 total population, which for a world population of 6.5 billion comes to 134 million babies per year.
Another indicator of fertility that is frequently used is the total fertility rate, which is the average number of children born to each woman over the course of her life. In general, the total fertility rate is a better indicator of (current) fertility rates because unlike the crude birth rate it is not affected by the age distribution of the population.
Fertility rates tend to be higher in less economically developed countries and lower in more economically developed countries.
The birth rate is an item of concern and policy for a number of national governments. Some, including those of Italy and Malaysia, seek to increase the national birth rate using measures such as financial incentives or provision of support services to new mothers. Conversely, others aim to reduce the birth rate. For example, China's One child policy; measures such as improved information about and availability of birth control have achieved similar results in countries such as Iran.
This text uses material from Wikipedia, licensed under CC BY-SA