Word: useless
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...technique that keeps embryos growing for a few extra days in a Petri dish. Until recently, clinicians had to put in-vitro embryos into the uterus when they were just one or two days old and relatively fragile. After that, the embryos' metabolism changes, rendering standard growth mixtures useless for nourishing them. That's why clinics insert several at once, which raises the odds of success but often produces triplets, quads and even quints...
After you've removed old files and useless programs, you should probably "defrag" you hard disk. A defragmentation program resorts the data on your hard disk to speed up its performance...
...events (similar to the Career Forum) often overflow with free stuff for the taking. At the Head of the Charles this year, I gleaned a Motorola megaphone for which I have no use whatsoever. I also picked up a bottle of bubble solution from Princeton Review and a completely useless keychain lanyard from Tag Heuer, the watch company...
Most retro-bikes are seen with a basket, which can be attached to the front or the back. These include the small wicker model, the milk crate, the traditional metal grid and the snappable, apparently useless leather pouch which hides beneath and in back of the seat. Nothing may be carried in these baskets. The seat is either in black or tan leather and is most often eaten away at the edges by some sort of decades' old fungus. Handlebars must be upright in "cruising fashion," and the number of speeds may not exceed three. A "bell" is optional...
Moreover, global warming is about general planetary warming but is perfectly useless when it comes to making reliable predictions about regional effects, such as waters warming in one area of the Pacific Ocean...