11.   In July, before boarding an El Al flight to Israel, he was briefly detained and searched because his behavior seemed suspicious, according to the Israeli airline.

12.   Risky behavior might seem like just a quirk of the oddly named species Homo sapiens, except that a taste for grandstanding is common in the natural world too.

13.   She has often brushed aside criticisms of herself as sexist, contending that her behavior would seem perfectly normal for a man.

14.   So the behavior seems meant to ward off rival suitors rather than to attract the attention of another female.

15.   Sometimes, employees go so far beyond the call of duty that their behavior seems to defy rational explanation.

16.   Still, her behavior seemed extreme.

17.   Such behavior may seem odd, but where would local fandom be without it?

18.   That is why his behavior at the world chess championship here this month has seemed so perverse and so baffling.

19.   The behavior seems to be analogous to the buckling of sheets of rock under pressure over geological time periods.

20.   Their behavior toward one another seems almost random, obeying no emotional logic.