Sites try to catch under-age users — "We are not burying our head in the sand," said Joe Sullivan, the chief security officer at Facebook — but verifying a young person's age over the Internet is a task that ranges from tricky to near impossible.
This will be tricky to pull off, and impossible without taking geography explicitly into account.
Over many years of use, water, soap, and other washing chemicals can sometimes harden around the base of the agitator, essentially "freezing" it in place and making it very tricky to remove (if not impossible).
Depending on where you live, it may be tricky to buy grasshoppers, but not impossible.
Drones are capable of self-levelling, so flight may be tricky to start with, but it's not impossible.
In fact, the data was a mess - tricky to use even for those in government, for those outside it's almost impossible.
That renders an exhaustive search impossible, and even a selective search, of the style used by Deep Blue to defeat Kasparov, tricky to run efficiently.
Primaries are tricky to cover.
Those are tricky to rewire".
