The oldest roller coaster in the world is the Leap-The-Dips roller coaster located in Lakemont Park in Pennsylvania. The roller coaster was built in 1902.

Modern teenagers are better behaved than their counterparts of 20 years ago, showing "less problematic behavior" involving sex, drugs and drink.

One-fourth of the world's population lives on less than $200 a year. Ninety million people survive on less than $75 a year.

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