I am a new user with the UNO and would like to start a class of 11 to 14 year old youth using the Nano.
Do all the sample programs work that I used for the UNO work for the Nano? Where can I find education lessons (projects) for the Nano? I have UNO but cant locate the Nano.
Thanks
Jim
Nano and Uno are identical for your purposes. Anything that works with an Uno will work with a Nano except that of course you would need to wire up a shield manually if you were to use one.
Search Youtube for "dronebot workshop". There's plenty of Arduino project videos there.
Same processors, so most UNO projects will work on a Nano.
One small difference is pin13.
The built-in LED on that pin is not buffered, like it is on the Uno,
so there could be unexpected behaviour if you use that pin as input. Fine if used as output.
USB supply back-flow protection is more basic, so the 5volt pin could be 4.6volt, which usually doesn't matter much.
The Nano has two extra analogue outputs inputs, which could be handy for some projects.
Leo..
However this is actually an advantage in one respect - in a project which uses significant power (more than a few hundred milliamps) where you are using a separate power supply (USB "phone chargers" rated at 1 or 2.1 Amps are very useful) which you connect to the "5V" pin (and ground) on the Nano, it is not necessary to disconnect the "5V" pin when you connect to the PC via USB as you need to using a UNO (or Leonardo, Mega 2560).
The point about the LED on pin 13 pulling it down does mean you cannot use INPUT_PULLUP (or mostly any practical pullup) on that pin. On a UNO, if pin 13 is not connected and left by default as an input, the LED may randomly flicker as the voltage is undefined.
a class of 11 to 14 year old youth using the Nano.
Nano and Uno are identical for your purposes.
I beg to differ. While the software and hardware are functionally nearly identical, I think many 11-14y olds will have a lot of trouble turning tutorials for a Uno into operational Nano projects 
A6 & A7 are analog INPUTs, not outputs, and cannot be used for digital input/output.
You may want to verify that all the nano's are using the same bootloader, having some with the current bootloader and others with the old bootloader will likely cause confusion.
One advantage of the UNO for educational use is the socketed atmega328, allowing for easy replacement when damaged, although the availability of inexpensive clone boards often results in the entire board being less expensive.
A major advantage of the nano type boards is the ability to plug directly into a solderless breadboard.
Duhh, must have had too much homebrew (beer) with the pizza.
Corrected.
Leo..
In short, Nanos rule! 
All you need is a NANO I / O Expansion Sensor Shield from Freeduino, Modulefans or others.
You will get the same Uno, but a simpler and more convenient connection of sensors and other devices.
Excellent suggestion, but you would need much taller socket headers to mount UNO shields, which is the only possible advantage of the UNO format.
Terminal Adapters are also very useful, though they do not facilitate the necessary multiple connections to ground and 5 V.
This shield does not have stackable headers onboard for installing Uno shields.
You need to solder them yourself.
Alternatively, you can use two rows of headers to bring up the Nano shield.
So far we have assumed OP means a "Classic Nano".
The new generation of Nanos is not compatible with UNO programs.
IMHO adding shields to a Nano could be more problematic (soldering etc.) for this age group than just using an Uno.
Leo..
It's just not clear if a person likes Arduino Uno and Uno shields, why would he need a headache with Nano.
If the Nano is really needed, teenagers do not need to solder the headers, this can be done by the teacher once, and the children will just work with them.
I do not use Uno shields, so the Nano + Nano shield suits me, it has headers for connecting sensors, UART, I2C and a separate 3.3V voltage regulator.
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