If is necessary to wear a crash helmet when riding a motorbike.
You don't have to wear a crash helmet when riding a pushbike.
Both true statements; the presence of 'bike' in both does not make them contradictory.
Ditto: unless( cond ) { statement; } and statement unless cond;.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
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