I've been presented with some information, some of which I will only comment on and some of which I further question. I'm sorry for any confusion to any of, especially since much of this is not uniform across the United States.
It's been brought to my attention that non-U.S. customers are seldom concerned about leaving tips for restaurant waitstaff. Since such U.S. employees usually earn much lower hourly wages, their income is augmented by gratuity. This is not uniform, however: some establishments do pay their staff somewhat more and restrict the staff from accepting tips. Also, it has been occasioned that a customer refused to leave a tip because of poor service (Mr. Fawlty might do even worse in the U.S.).
With a reminder that the U.S. is made up of self-governing states, alcoholic beverage sales are not the same in all. For further confusion across their state, individual municipalities must choose to allow the sales in Kansas, Mississippi or Tennessee. Not the only state to restrict the sales on Sundays, New Hampshire bars give a last call before midnight on Saturdays.
It was mentioned that many outside the U.S. aren't used to our smiling at strangers. This can be for various cause other than habit, the smile usually just being a smile; however, it can also be disguising a grimace.
OK, I must also inquire here. It was stated that only the U.S., Liberia and Myanmar use the 'imperial' measurement system rather than metric. Since we were more than inched into it -- and with many miles behind us -- by you Brits, for good measure, do any of you still stand on your feet?
U.S. origin fast food chains have caused the spread of 'free drink refills' (particularly, soft drinks). It was specifically stated that France put a ban on unlimited refills due to obesity rates. My comment here is that carbonation drastically increases the digestive sugar transfer process to the bloodstream. A diet soda may have nothing to transfer by itself -- unless you eat something with it; what and how much you eat with it is what has a greater impact. If you keep stuffing yourself without the drink, your body will still swell without looking so swell.
A U.K. resident wrote on Reddit, "Americans can't have just one thing. It has to come in blueberry, vanilla, diet, low fat, low sodium, big, small, round and GRAPE, everything is grape flavoured. Nothing is grape flavoured in the UK."
I must remind you that one of the first European names for (at least a portion) of North America was Vinland, the land of grapes. On the farm I grew up on we had wild grapes (very small and sour, by the way), concord grapes (fairly large but, to me, somewhat bland) and a sweeter marble-sized purple grape that was only very slightly tart. One of my peeves has been that I could never find diet grape soda in the 2 liter size (not only cheaper but I drink no more than a glassful at a time; with a smaller bottle I'm more apt to empty its entire contents -- into me.
It was stated that it was @ $25,000 for public, in-state colleges and $50,000 for private universities yearly in the U.S. (per 2016). The revelation they gave here is that U.S. citizens pay a high price to become educated fools, whereas in countries like France and Germany it is free.
It was stated that in Australia and New Zealand, opting for a cab's backseat is considered rude. Especially in larger U.S. municipalities, allowing a customer into the front seat gives a possible robber direct access to the controls should the driver be otherwise dispatched.