Sentence examples for a significant challenge why from inspiring English sources

They further hold that there is no unique privileged present time, and a fortiori that there is no such thing as a moving present.[24] Block theorists face a significant challenge: Why does time seem to pass if it doesn't?

Associate professor of crop genetics Sean Mayes says there are many reasons why producing enough food will be a "significant challenge".

"It's a significant challenge.

Still, she faces a significant challenge.

That's a significant challenge.

It would be a significant challenge".

Mercury, however, has posed a significant challenge.

And therein lies a significant challenge.

Reading these texts is a significant challenge.

Would carbon composites create a significant challenge?

"It's a significant challenge," said Melinda Arnold, a spokeswoman.