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.
When the universe had cooled some more, those particles and antiparticles should have gone on to annihilate one another, leaving only photons behind.
ECONOMIST: Particle physics makes sense, but it assumes too much
But that would suggest that, when things had cooled down a bit, these particles would eventually have annihilated one another leaving nothing but energy behind.
This game is played in moments, one turbaned enemy popping up from behind cover, another rushing at you from behind a door.
We always come out on top because we pull together, because we look after one another, because we leave nobody behind -- we pull folks up.
WHITEHOUSE: Remarks by the President at a Campaign Event -- Las Vegas, NV
One upshot of this gambit is renewed energy behind another hardy perennial on the anti-nuclear community's agenda: the idea of "de-alerting" of U.S. -- and, ostensibly, Russian -- nuclear forces.
But thanks to one technical glitch after another, the new plane is running way behind schedule.
Behind each constitutional restriction stands a vested interest of one sort or another.
Most were stone-faced and several were so eager to leave the public parking lot behind the courthouse that they almost backed their cars into one another.
Another artist joked morbidly that one day Picasso would be found hanging behind "his giant canvas".
Another, bigger one, is being fitted out at a site behind nearby Oxford Street.
Go somewhere away from home so you can focus on enjoying one another's company and leave your smartphone or other work device behind.
He plays another vital role at FORBES GLOBAL, one that is perhaps the most behind-the-scenes.
The set now back under his control, Murray closed it out with another break as he fired one brilliant winner down the line from deep behind the baseline, before racing in to collect a drop shot and whip a cross-court forehand past Federer on set point.
BBC: Andy Murray beats Roger Federer to win Shanghai Masters
In third place behind Depp is Brad Pitt, who has two nominations: one for Twelve Monkeys and another for last year's The Curious Case of Benjamin Button.
Another bunch of banks merged into a new one, leaving their debt-ridden shells behind.
By passing through this screen, visitors leave behind the grid of the city streets and enter an experience where spaces flow freely into one another, gently canted forms lend a sense of dynamism to the walls and ceiling, and surfaces de-materialize into the weightless, illusory depth of the moving image.
ENGADGET: Museum of The Moving Image plans multi-million dollar updates with HD, 3D
Another friend told me Facebook has made her compare the life she has to one she left behind.
Children still played out in the streets around here: a gang circled on bikes, shouting to one another, two boys to a bike, the front one standing to pedal, the one behind with his legs splayed wide.
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