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    what is the appearance of recovered copper in copper cycle lab?

    I am doing a copper cycle lab, but I do not remember how the recovered copper looked like in the end and how it is different from the original copper used in the beginning of the copper cycle lab thanks!
  2. S

    Is at&t cheaper than sprint?

    Give it up, your parents know a good buy. Sprint is cheaper and while the iPhone has been a highly successful handset AT&T has admitted that their network is having difficulty keeping up with the demand. Sprint is rapidly building out a 4G network. I'd go with a Pre or a Hero.
  3. S

    best phone for tmobile?

    Upgrade or new phone service? Tmobile has a full qwerty free with new service on their website and several less then $100.
  4. S

    Why do some meats get tender from long periods of cooking and others get tough?

    I've noticed that some beef shanks I boiled for about 3 hours at a medium-high temperature got really soft afterwards - falling off the bone. Yet I've had pork spare ribs boiled in the same way get really tough (after cooking for an hour). Why? We're always advised not to "overcook" meats...
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