The incredible (non-)shrinking holes

[Phil Payne]

> Having just explained nuclear fusion to my
> seven-year-old by using mini chocolate chips ...

Not a good idea.  I explained Olber's Paradox to my son when he was seven:

http://www.schoolsobservatory.org.uk/study/sci/cosmo/internal/olbers.htm

A few weeks later, his poor schoolmistress tried to explain to the class why the sky was dark
at night - but she had one little voice saying: "Please Miss, it shouldn't be!"

--
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803