Aurora Cannabis Inc (NASDAQ:ACB) and Lumen Technologies Inc (NYSE:LUMN) are this week's picks for Schaeffer's Cheap Seats: Stocks Under 20segment.Thoughincompletelydifferentsectors,bothstockshaveonethingincommon−−theirsoaringpriceactiontoday.Plus,eachwerewithinpennystockterritorywithinthepastcouplemonths.Atlastglance,ACBwasup5.46.20 after the Canada-based cannabis company's fiscal first-quarter results. The stock has been seeing pressure near $6.30 for roughly the ...