In article ,
Martin Angove wrote:

There are 11 types of people in the world. Those who don't understand
binary, those who do but don't get the joke, and those who get the joke.

Yep. Bob Eager has that as a sig at the mo.

Oddly I am wearing this tshirt today :

http://www.thinkgeek.com/tshirts/frustrations/5aa9/

Working in a computing department it is scary how many people don't
understand it. I guess binary is so hidden from todays computer scientists
that they just don't need it

Maybe the OP ought to get one of these for his "student":

http://www.thinkgeek.com/cubegoodies/lights/59e0/

Tell him he can't go home till he has worked out what the time is

Cheers,

Darren