Their suitcases are full of clothes and toiletries they need for the week -- but it's the invisible suitcase of pain and rejection that is the heaviest to carry up the stairs to their assigned room.
But it also means successfully walking that invisible line between creativity and unethical chicanery.
This one delves pretty deep into head-scratching territory, but it looks like the folks at Invisible Things Lab have discovered an exploit that could open the door to some potentially serious attacks on certain Intel CPUs paired with some popular motherboards.
ENGADGET: New SMM exploit targets Intel CPU caching vulnerability
"You can think of it as a kind of molasses-like bath that's invisible, but yet we're all immersed within it, " Greene said.
The holy ghost moved invisible, but they could feel it in the rafters, sense it racing inside the walls.
"We are taking a pounding daily from bullies, but for the most part it is still an invisible problem, " said psychologist Gary Namie, who runs the institute.
An aeroplane shrouded in such kit might be invisible to the human eye but it would be picked up readily by radar, which operates at radio wavelengths.
The TelePrompTer projects the text in front of the newscaster so that it is easily seen by the anchor, but is invisible to the viewers.
In order to see light, the eye must absorb it, but in order for a person to be invisible, the body must not absorb any light.
Allowing yourself to be invisible in the workplace may be comfortable, but it is a surefire way to underearn.
The idea that there is no god (or some secular version of him) meting out cosmic justice through the market's invisible hand is unsettling, even to market advocates, but it shouldn't be.
Obviously, Japan will need to rebuild and either way it will recover, but she will do so more quickly by letting the invisible hand point her forward.
But it turns out that, behind the scenes, Sony may also be installing invisible services in the form of a hidden directory containing cloaked files, which run when you use that media player.
Children are many things these days, but they certainly aren't invisible -- especially on the Internet, where it is the kids, these adolescent messengers, who are becoming the McLuhanite message of our networked age.
The most popular of these quirky relationships is the Super Bowl indicator, which basically says it's not Adam Smith's Invisible Hand moving the market, but Vince Lombardi's.
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