Great Famine Ireland population decline emigration

Ireland’s population fell by 30% during famine

During the Great Famine of 1845–1849, Ireland’s population of more than 8 million fell by 30%. About 1 million people died and another 1.5 million emigrated. Emigration helped keep the island’s population declining until the 1960s.

Crowds can create their own rules when nobody knows what to do

One theory of crowd behavior says people in crowds do not simply stop thinking. When a situation is unclear, people can watch one another and develop new local rules for how to act, even when those rules differ from normal behavior.

Polar ice holds more water than groundwater, lakes and rivers combined

Earth’s large polar ice sheets contain more water than all of its groundwater, lakes, rivers, and atmospheric water combined.

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Great Famine Ireland population decline emigration

Ireland’s population fell by 30% during famine

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