the fact that WAVX closed Monday at about $18.25 and opened Tuesday at about $19.75. In other words, it "gapped up" about a buck and a half. There were several press releases related to the WAVX demos at the Intel Developers Forum Tuesday before the market opened. This created bullish sentiment about the stock such that no one was willing to sell in the high 18s or low 19s when the market opened. Thus the first sale didn't occur until the bid reached the high 19 dollar range.
Conventional wisdom among technical traders says that such a gap must be "filled" before the stock can continue climbing. That is, the price will retrace back to the low 18s before it moves up again.