Mumbai, Jan. 29 -- Copper continues to linger around a three-week low on Wednesday morning in Asia, extending fall from the previous session as China, the world's largest importer, reported an unexpected contraction in manufacturing activity in January, adding fresh concerns over its demand growth amid elevated global refined copper supplies. The metal is down half a percent and testing a three week low at $4.22 per pound mark. Meanwhile, in overnight stocks, the tech-heavy Nasdaq led the way higher after posting a particularly steep loss on Monday, limiting losses in the counter. The Nasdaq surged 391.75 points or 2.0 percent to 19,733.59, partly offsetting the 3.1 percent plunge seen during yesterday's session. The S&P 500 also jumped 55....