I admit to being not well-informed about physics but I found the Discussion about this on Start the Week on Radio 4 this morning completely fascinating www.sciencefactory.co.uk/authors.php?aid=85
AIBU To Be So Annoyed at the Stupidity of This
Father's Day Sunday — nobody makes cards for this type of dad


. (Failed physics O level 3 times but did go on to get a science degree - I thinks there's science and then there's physics!)