Readers discuss a guest essay about birthrates and the world’s population. Also: A citizens’ celebration for America’s 250th ...

To obtain comprehensive and accurate data, it is necessary to conduct field surveys of ground substrate, arable land, soil quality, and other natural resource classes. This is in difficult and key ...

Humans can remember various types of information, including facts, dates, events and even intricate narratives. Understanding ...

A new genomic study reveals how human populations adapted, survived, and diversified in the Himalayas, one of the most ...

Cancer does not develop overnight. It can take decades for cancer‐promoting changes in the genome to eventually lead to the ...

Objective To assess short-term differences in population mental health before and after the 2008 recession and explore how and why these changes differ by gender, age and socio-economic position.

Objective To determine whether new users of proton pump inhibitors (PPIs) are at an increased risk of gastric cancer compared with new users of histamine-2 receptor antagonists (H2RAs). Design Using ...

Variability measures how widely a set of values is distributed around their mean. Here's how to measure variability and how investors use it to choose assets.

Effective and noninvasive whale and biodiversity monitoring is now possible with the help of citizen scientists, opening up new opportunities for marine conservation. Water samples collected during ...

Birthright citizenship ruling handed down by the U.S. Supreme Court. How many people gain citizenship this way?

Pew Research Center’s team of demographers, economists and other analysts accesses and uses a wide variety of publicly available data sources to conduct its population research. Much of this data is ...