How many women and men are in this world?

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In 2011 the world population was 7 billion people (women and men). Including 3 billion 500 million are women.
Do not believe now that women are much more, this imbalance occurs after age 50

Why money are better than bartering?

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Barter exchange involves products after eye (without a scholarship, a specific value). Money on the other side are those who add value to a product, so money is a unit of exchange more valuable than barter
per se.
In reality ease the ban does nothing to barter. Provide certain services for money, money which then in turn buy our services and goods - bartering.      

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Why we need a desk for laptop or computer?

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Whether you work on your computer or laptop (newest tablet) is required to have an office (that furniture made of particleboard or wood). If you work long hours sitting in bed you have medical problems (column, dizziness, etc.).
       

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Why paying jobs are most dangerous?

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Because if anyone could do would be trivial usual - almost equal to unskilled work.
The more difficult and dangerous (physical, mental, moral) is a job, the less will have suitors, and thus will be well paid.       

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