Given that cod liver oil is good for arthritis, why do they put child-proof lids on the tubs that any self respecting child could open but makes it just about impossible to open with arthritic hands ?

If oil is so dangerous for children, why don't they put child-proof caps on litre bottles of corn/sunflower/olive oil ?
Why is it that T&M put the important seed info (year packed/sow by) on the top flap of seed packets, just the bit you tear off to get at the seeds ?

Mr Fothergill put theirs on the bottom flap.
Lastly (for now) why do courgettes insist on producing myriads of female flowers when they first start flowering and no male flowers to accompany them ?

My 2 plants now have 4 female flowers but of course they will never become courgette fruits, all because I forgot to order parthenogenic ones and you can't get them in garden centres around here.
Feel free to add your own, or even give explanations.