Humans have harnessed wind power for thousands of years. Sailboats and windmills both rely on moving air masses to generate power. Modern day windmills have taken the harnessing of wind power to new levels, sometimes generating power for a thousand homes per windmill. Wind farms are one of the fastest growing sectors of renewable energy production. Huge windmills are placed in areas with reliable wind patterns, and have become less expensive to install than almost any other form of electrical production. In the future, more windmills will populate the countryside, suburbs, cities and even oceans. Millions of dollars worth of research is being done to make offshore wind farms a reality in the near future.