11.   Another reader challenged the notion that the project should be judged unworthy just because it would require taxpayer subsidies for its creation and subsequent operation.

12.   As the number and age of such settlements grows, the evidence also challenges the notion that the Bering land bridge was the only route to the Americas.

13.   At an afternoon news conference, WednesdayUS Attorney Donald K. Stern said the case against the teenager was meant to challenge the notion that hacking is harmless fun.

14.   Black feminists chastise him for challenging the notion that black women suffer from double discrimination because of their race and sex.

15.   But new research is challenging that notion and shedding light on the hidden life of the shark, revealing a finicky eater that may find people unpalatable.

16.   But new research is challenging that notion and shedding light on the hidden life of the great white, revealing a finicky eater that may find people unpalatable.

17.   But others challenged that notion.

18.   But some geologists, armed with tantalizing bits of fossilized plants, are challenging that notion.

19.   Carolina challenges old notions.

20.   Closer to a graphic design than to a place to sit, it challenges old notions of high design.