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5124 views	0 answers	How does a ballpoint pen work? updated 7 years ago by attemptnwin
2016 views	0 answers	Why don’t currency notes disintegrate when it gets washed? updated 7 years ago by attemptnwin
1685 views	0 answers	Why do some newspapers turn yellow over time? updated 7 years ago by attemptnwin
1707 views	0 answers	What are the three basic types of touch screens used to recognize a person’s touch? updated 7 years ago by attemptnwin
3333 views	0 answers	What is global warming? updated 7 years ago by attemptnwin