But at one time or another, we have all been left behind while the one we love has gone off to train for battle, or keep the peace, or wage war.
But have we actually left all of it behind?
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Bono, who spent decades in the entertainment industry and gained fame as half of the popular singing duo Sonny and Cher, left it all behind in the late 1970s to start a restaurant in Palm Springs.
All of us left our families behind.
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Carmelo Anthony, long criticized for his play when the game is on the line, can throw this at his critics: his 8.1 average point tally in the fourth quarter is up from the 6.9 he scored during the regular season and second behind all scorers left in the playoffs.
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But because the bosses are afraid of being left behind, they all do it.
Just as Wheeler's software could find all the crimes where the killer left behind a telltale clue, it could crack rings of fraud artists who change their names and hit a different insurance company every time.
The No Child Left Behind law requires that all children regardless of income, race or ethnicity be able to read and do math at grade level or above.
"Because economies that work only for the few and do not bring out the best in all its people will ossify and be left behind, equality of opportunity is an economic necessity, " he said.
Clients often start by expecting to find a maid who, like the north-easterners who came to the city 30 or 40 years ago and worked all the time because they had left everything behind, will live in and take only every other weekend off.
Today, a stent is left behind in perhaps 75 percent of all angioplasties done in the U.S. Most are drug-eluting stents.
Alan Woods, chief executive of the Blue Flag scheme, urged all beaches to enter the scheme or risk getting left behind.
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During warm interglacial periods, when there may have been no sea-ice at all, an abundance of marine organisms would have left behind fossilised shells.
You know, the purpose of No Child Left Behind was to make sure that all kids are learning and that the lack of progress by some kids isn't hidden behind the accomplishments of the other kids.
All we need is to work out the small wrinkles left behind by well-intentioned technocrats, and our problems can be solved by compromise.
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As Microsoft, RIM and Nokia where completely left behind, the newly formed duopoly focused all their efforts on capturing each others market shares, especially Google.
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This time there has also been more emphasis on managing the morale of those workers left behind after the cuts, most of all by trying to show that the pruning is necessary and fair.
Unless we soak our tables for many minutes and scrub our hands like surgeons, we can't kill all the bacteria on our skin, and what is left behind to survive and multiply are the stronger and more resistant germs.
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First of all, what are you going to do about No Child Left Behind?
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Everyone is kindly and reasonable, all the upholstery comes from Liberty's, but the impression left behind is of a sort of watery melancholy.
And to all of those who are oppressed and abused and left out and left behind, they are saying: I am standing with you.
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But plenty of other groups have left their mark: behind one stretch of Crenshaw Boulevard all the gardens are planted with bonsai trees, the work of a colony of Japanese who settled there after internment during the second world war.
"These states are getting more flexibility with federal funds and relief from No Child Left Behind's one-size-fits-all mandates in order to develop locally tailored solutions to meet their unique educational challenges, " Education Secretary Arne Duncan said in a call with reporters.
All right, so that's the answer to the No Child Left Behind.
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And the President has a plan to fix No Child Left Behind by offering states flexibility from its one-size-fits all mandates.
Not to be left behind the upstarts, Brocade, IBM, and HP all announced products aimed at the big data market.
Based on the assumption that all future generations will have to pay the bills that today's generation has left behind, Mr Kotlikoff tries to measure the present value of net future taxes (that is, taxes to be paid minus benefits, such as pensions, to be received) for individuals of different ages over their remaining lifetimes and, collectively, for future generations.
Obviously it hasn't left behind the death and destruction that Katrina and Rita left behind, but it's caused incredible pain and hardship for communities all across this country -- communities that have seen too many jobs disappear, too many businesses close, too many middle-class families who are just barely making it.
In K-12 education, the No Child Left Behind Law has produced important benefits for students by holding schools accountable for the academic achievement of all children.
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