Since March 11 , when the markets major indexes were at their lowest levels since hitting multiyear lows in October , the tech-laden Nasdaq has climbed nearly 20 percent .
Since March 11 , when the market 's major indices were at their lowest levels since hitting multi-year lows in October , the tech-laden Nasdaq has climbed nearly 20 per cent .
a scientific field that focuses on creating machines capable of performing activities that require intelligence when they are done by people.