11.   But neither a neutron star nor a black hole has made its presence known.

12.   But they make their presence known.

13.   But we finally convinced the cops to just walk through the mob, making their presence known, and it did calm things a bit.

14.   But when Ducasse is on hand, he makes his presence known.

15.   By the time most gallstones make their painful presence known, there are not always a lot of options.

16.   Certainly Vasser has made his presence known to IndyCar.

17.   Children made their presence known at other buildings, too.

18.   Daft has moved quickly to make his presence known by engineering key personnel and strategy moves.

19.   Either divine intervention or the wily devil making his presence known.

20.   Embedded chips, by contrast, barely make their presence known.