Those unanswered questions

At what point does a stone become a rock?
Related to that, but going the other way ...
You know we're now allowed to move small stones out of bunkers?
Isn't a grain of sand a very small stone?
In which case why can't we remove all the sand around the ball before playing it?
 
I googled this and learnt something new today.

'The main difference between flammable and inflammable is that flammable substances require an ignition source to catch fire, while inflammable substances can catch fire on their own'
A substance catching fire due to heat generated within itself is spontaneous combustion.
That is spontaneous combustion of a flammable substance or spontaneous combustion of an inflammable substance.
 
If you had
3x + 1 = 10
3x = 9
x = 3.

But, 3x + 1 could be worth anything. x is a variable so it can represent any number if it doesn’t equal anything.
And according to Google, that’s one of the easiest unanswerable equations 😳😳
The next one is WHS3x +1😉
 
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