Challenge used in a sentence

Challenge in a sentence as a noun

But the Apple inventors' filing date is January 2007; swearing behind that far would be a real challenge.

The challenge you've briefly engaged with isn't a problem; it's a market opportunity.

Information that might challenge the groupspeak is discarded.

Some consider this a credit, some a detriment, but no matter what I consider it to be a huge technical challenge.

Learning foreign languages to high levels of communication proficiency was the first adult learning challenge I took on.

The patent bar is in an uproar that issued patents might not be deemed presumptively valid when challenged but might be much more vulnerable to challenge going forward, and so too are the trolls.

Challenge in a sentence as a verb

Finally, Aubrey De Grey's unapologetically straightforward logic [1] regarding aging has gained traction with the crowd who has the means to tackle this grand challenge.

Our biggest challenge is not IV, but all of those people in the world who give IV and people like them a nod, a kind of respect, an admiring acknowledgement that they've abused the system and gotten away with it.

They don't want to challenge the government, they don't want to question it, not even when it's clearly violating it's own most important rules - the rules that, presumably, we've been fighting to promote these last 200 years.

And as the challenge went on we discovered that he had cornered Jon in a room to try and get him to speak poorly of Zoe, the only negative “story” they could muster out of all fifteen contestants.> “Two of the other teams have women on them.

The reason it is not a particularly exciting case from a headline standpoint is that it deals with what appears to be a specialist technical issue of patent law, that is, what is the proper "standard of proof" to be applied when a patent is challenged as being invalid?