Related topics: united states · barack obama · health · population

Darwin's finches have reached their limits on the Galapagos

The evolution of birds on the Galápagos Islands, the cradle of Darwin's theory of evolution, is a two-speed process. Most bird species are still diversifying, while the famous Darwin's finches have already reached an equilibrium, ...

How DACA affects the health of America's children

In recent years unauthorized immigrants known as "dreamers" have captured nationwide attention and become a force in American politics. Brought to the United States as children, these young adults came forward to ask for ...

Visa restrictions can lead to increase in illegal migration

While Government-imposed restrictions on immigration can reduce overall migration, they can also be ineffective or even counterproductive, pushing more would-be migrants into unauthorised channels, finds new UCL-led research ...

Lifting barriers to citizenship for low-income immigrants

Taking the Oath of Allegiance at a naturalization ceremony is an emotional moment for many immigrants, and for good reason: it is the culmination of an often arduous process and many years of striving. Citizenship also opens ...

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Immigration

Immigration is the arrival of new individuals into a habitat or population. It is a biological concept and is important in population ecology, differentiated from emigration and migration.

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