1.   Making the correct change was a big hurdle for my father.

2.   Another big hurdle is getting the compound into pill form.

3.   Big hurdles remain.

4.   Big hurdles face corporate Mexico.

5.   A big hurdle remains, however.

6.   But a big hurdle is computer security.

7.   But big hurdles remain.

8.   But even if all goes well with the IRS, the software publishers still face a big hurdle in getting all their state programs in order.

9.   But getting that interview is a big hurdle.

10.   But many big hurdles remain, including how to miniaturize electrodes and implant them safely, and practical devices are a long way off.