And yet ESA struck an optimistic note in its Mars500 press release: "This mission might lack some of the glory and feeling of the real flight, but it is just as tough and will yield a lot of experience for the future.
History suggests that after a certain point tougher I.P. rules yield diminishing returns.
Moreover, as the recent fencing between Mr. Pitt and Mr. Spitzer has shown, hesitancy on the part of the S.E.C. could actually yield tougher rules for Wall Street and corporate America, if other regulators or Congress steal a beat on the agency.
The scraped knees healed, as did the broken hearts; the tough homework assignments yielded test grades making them all worth the post-midnight hysterics.
Know your source, as older chickens yield tougher, stringier meat.
When things aren't going as well as they once had, it can be tempting to call it off, but working through tough times can often yield better results.
If the kiwi feels a little too tough and does not yield to the gentle pressure, then the kiwi is not yet ready for consumption as it still has not yet fully ripened.
"It's time for more than tough talk that never yields results.
A stark excerpt of "My Funny Valentine," with Wallace Roney on trumpet, morphed into Mr. Hancock's "Eye of the Hurricane," which yielded a tough, shivery solo by Mr. Shorter, built at first around a single fillip in the melody, and then a single note.
Poly(BSMS-b-ProHEMA) yielded a tough membrane by casting from its toluene solution.
Those low rates have a dark side, of course: They've made money market accounts useless for those looking to growth their cash and they've also made it tough to find nice yields among investment grade corporate bonds.
