Investors can't forget the nightmare that resulted from surging oil prices in the past.

The buyback is a big boost for investor confidence in the stock. The move will also lift United Microelectronics' per-share earnings going forward.

Probably Cosmos' major shareholders still declined to hand over management control to GE.

The decline in the oil price is certainly a load off for investors as well as manufacturers in Asia.

Microsoft's move is a blow to all personal computer- related shares because it might weaken the companies' margin growth as new products usually have higher margins.

Worrying that a catastrophe will hit earth tomorrow is a constant worry for some, but that shouldn't be an issue when it comes to investment. You can't be fully prepared for unforeseeable events.