[Space] condensation on lenses

[Jonathan Moore]

On Wed, Jun 9, 2010 at 10:08 AM, Blake Barrett <Blake at blakebarrett.net> wrote:
>
>    The thought of using a hand warmer has arisen before, but all the ones we
> have come across are either electric (and thus requires batteries) or are
> chemical based that require oxygen to create their heat.

Backus uses the air breathing hand warmers and it has worked out well for them.

-Jonathan