Few have challenged the idea - and for good reason.

Photography also continues to challenge the very idea of what art is.

"I think he challenges the idea of the star curator."

This is why the resolution adopted today does not challenge the idea of making the agreement itself.

Well I'd just like to challenge the whole idea of this right of every woman to have a child!

Now they are challenging the idea that the only job for outside investors is to write checks.

It's about challenging the very idea that someone, or something, can be "too Jewish."

They challenged the idea that an Irish band had to leave the country to be successful.

This challenged the idea that changes in price were normally distributed.

"This also challenges the idea of what race is and shows us that people are fluid in how they perceive themselves."