This free-fall in the value of the troubled bank can be largely attributed to a series of developments over the weekend which cast shadows over the financial sector as a whole and on Bank of America in particular.

FORBES: Numbers Show Bank of America Stock Should Be $11

That would enable physicists to see whether the number of high-energy positrons matches the theory's expectation and thus, appropriately, use shadows to cast light on the existence of dark matter.

ECONOMIST: The search for dark matter: Ethereal yet weighty | The

Even after such companies develop a few layers of management, the CEOs often continue to cast long shadows.

FORBES: Why Dictatorial CEOs Increasingly Put Their Companies at Risk (and What to Do About It)

It was "eye floaters, " microscopic grey globs that cast shadows on the retina, that inspired California Institute of Technology professor Changhuei Yang to create a lensless microscope that aims to change the way scientists go about diagnosing diseases and developing new drugs--for a fraction of the cost.

FORBES: Magazine Article

It was "eye floaters, " microscopic grey globs that cast shadows on the retina, that inspired California Institute of Technology professor Changhuei Yang to create a lensless microscope that aims to change the way scientists go about diagnosing diseases and developing new drugs--for a fraction of the cost of a conventional microscope.

FORBES: Magazine Article