John W. wrote:
In article 3752c192-9e96-46b5-bbbf-c4dca6ce8700
@i76g2000hsf.googlegroups.com, says...

Speaking of which, you know the pathologist on one of the CSIs who has
a pair that snap together? How do they work? Magnets? The action is
always too fast on the screen to make out what happens.

Neodymium magnet, see
http://www.glassesdirect.co.uk/relea..._30000065.html

I'm just thinking - why? Am I missing something?

David