What is uncertain is how much further the bubble can expand, and what might pop it.

What do you call a stock that's down 90%? A stock that was down 80% and then got cut in half.

Microsoft could help Facebook with one of the biggest challenges, namely monetizing its traffic without reducing the user's experience. It's obvious that Microsoft needs traffic and Facebook needs search.

A 99% Value-at-Risk calculation does not evaluate what happens in the last one percent... This is like an airbag that works all the time, except when you have a car accident.

As an investor my job is to figure out what will happen rather than what should happen.

When you leave a good job to go off on your own and don't expect to make money for a while, you name the firm whatever your wife says you should.

Microsoft has one more shot at a role in smart phone software through its deployment on Nokia phones. Nokia is still the global market share leader in cell phones. Maybe it will work out, but this is hard to envision great success in the area coming on the heels of so much disappointment in missed opportunity in this important and visible category.