For tax-conscious investors, it's a good rule of thumb to sell losers while holding onto winners.

FORBES: Magazine Article

Statistics vary, but a good rule of thumb is that 90% of startups die within their first three years.

FORBES: Why We Need Startups

It is a good rule of thumb that if the roof sweeps and tapers out like a dainty swallow's tail, the family who built it was wealthy.

BBC: Overcoming 40 years of solitude on Kinmen Island

So when the atmosphere cools down one part of the globe, it is a good rule of thumb that it is warming some other part.

ECONOMIST: Britain��s cold snap is explained by the Arctic oscillation

Subtract all expenses and property taxes (30% of the rent is a good rule of thumb) and multiply by 12 to get the annual net operating income.

FORBES: Let Your Landlord Sweat Instead

And I think that is a good rule of thumb.

FORBES: An Interview with Dan Rosensweig of Chegg

There has always been a good rule of thumb that your HDTV doesn't need the help of a DVD up-scaler if the HDTV has a good processor in it.

ENGADGET: High-end DVD up-scalers - a great alternative? HD

Here's a good rule of thumb: If your total student loan debt exceeds the amount you expect to earn in your first year out of school, you're borrowing too much.

NPR: Exercising Caution on College Loans

This may be tangential to the broader questions this whole affair has rustled up but I think that shooting uphill is a good rule of thumb, whether or not you face legal threats.

FORBES: Should Robert Florence Have Called Out Lauren Wainwright In The First Place?

Often we accept people into our social networks by extension of trust, i.e. a friend of a friend, so a good rule of thumb might be to question how well you really know a person before accepting a new friend request.

FORBES: Be Careful Who You Know