According to the old guidelines a patient with a grade 1 concussion may have been allowed to return to play if they were free of symptoms within 15 minutes, while a patient with a grade 3 concussion may have been recommended to sit out for up to 2 weeks.
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As a result, cars going from factories in Detroit to showrooms in Seattle, or grain from the plains heading for the ports of the east coast, have to sit around for up to 24 hours on sidings in switching yards in Chicago or Sioux City, as the wagons carrying them are uncoupled from one firm's locomotives and shunted to those of another.
They wake up, sit down for breakfast, send their kids off to school.
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These living fossils are wildly popular (last autumn one Surrey grammar school had to call the police for crowd control when 1, 500 children turned up to sit its entrance exam for 126 places), but their freedom is being eroded.
While network execs regularly pray for big market matchups for the NBA, MLB and NHL postseasons, they pretty much sit back and watch the numbers pile up for the NFL playoffs.
When it arrives at the space station in 2015, scientists will blow it up and let it sit for a few days to test for leaks.
Somewhat stupefied, I hailed the next cab in line and politely asked the driver if I could sit up front as it was easier for my leg.
Mega-philanthropist and billionaire Ted Turner, who displayed such comfort with being on stage and with the subject that it was hardly necessary for him to sit up straight, over-shared that men are too testosterone-jacked to stay in any power positions at all.
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"You'd have little packets that had this powder in it, you'd fill up your pitcher of water, you'd dump in the powder, stir it up, let it sit for a little bit, and then you'd have a permanent magnet that draws all the minerals down towards the bottom of the pot, and then you pour off the relatively clean water, " he said.
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No one stayed up all night to sit in line for the latest corporate BlackBerry handset.
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Durant's announcement that he'd sit out his final game to rest up for the postseason saved Anthony some scoreboard-watching, because it isn't unheard of for players who are second in the scoring race to go for broke in hopes of finishing on top.
Ports for micro-USB and a 3.5mm headphone jack sit up top, with the volume rocker and lock key on the right and a covered slot for microSD or, in the case of the (gold) 308, a second full-sized SIM on the opposite edge.
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Just like they told you for your school photo, sit up straight, wet your lips and lean forward just a bit.
Most Americans do not become members of a church to sign up for a crusade or to sit in judgment on miserable sinners.
She said it was time for Cathy Jamieson to "sit up, take notice and do something about these problems before they get any worse".
Still, the Republicans cannot just sit and wait for the Democrats to mess things up.
And all the houses sit hard up against the streets, with little space for car parking.
It is why they set up display booths and will let you sit their for hours to familiarize yourself with whatever product you want.
Former US national team coach Steve Sampson believes the American public will now sit up and take notice of the team after qualifying for the knockout stages of the World Cup.
You hand out invitations to people all over town (who promptly decline to come) and then when you return to him, the game forces you to sit there for two minutes while no one shows up and Claptrap tries to make awkward small talk with you at his empty party.
All that means that the party cannot sit back and simply wait for Tony Blair to trip up.
The number of those satisfied with the amount of room for all passengers to sit or stand went up 1% to 69% compared with autumn 2011.
Before the Vice President goes up for a meeting like this, does he sit down and get instructions from the President?
That allows for the use of jack up rigs which sit on the bottom of the seabed and are safer to use.
HINT, crops up in 11 different genes for receptor proteins that sit on a cell's surface waiting for messenger molecules from other cells.
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We think it honors our heritage to the blue box while taking it forward and we want our customers to sit up and take notice of Gap and see what it stands for today.
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The party which paved the way for the Scottish Parliament in 1999 now has to sit up and take note.
Aside from these feeling states, I remember that my desk faced my bookcase and that Getting to Yes sat there until the day I packed my books up to take to another firm, where it would sit unread for even more years.
They should let the bleach sit for 15 minutes before using a mop or sponge to clean up.
Tied up in port sit two massive iron ore transporters carrying the raw material for the world's car making industry.
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