From a technical perspective, Pan American Silver (PAAS) is looking like an interesting pick, as it just reached a key level of support. PAAS recently overtook the 20-day moving average, and this suggests a short-term bullish trend.The 20-day simple moving average is a popular investing tool. Traders like this SMA because it offers a look back at a stock's price over a shorter period and helps smooth out price fluctuations. The 20-day can also show more trend reversal signals than longer-term moving average ...