Can anyone explain lactose intolerance?

Anonymous
Can anyone explain why everyone in Scandinavia can drink milk but no people in China?

Lactose intolerance by country
Ghana - 100%
Malawi - 100%
South Korea - 100%
Yemen - 100%
Solomon Islands - 99%
Armenia - 98%
Vietnam - 98%
Zambia - 98%
Azerbaijan - 96%
Oman - 96%

Lactose prevalence by country
Denmark - 4%
Ireland - 4%
Sweden - 7%
United Kingdom - 8%
New Zealand - 10%
Netherlands - 12%
Norway - 12%
Niger - 13%
Belgium - 15%
Cyprus - 16%

And USA is at 36%. So why can a Swedish person handle lactose while a South Korean person can't?
Can anyone explain lactose intolerance?
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