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That is such a cool link. My favorite one is the Rubik's cube. The other reason I was writing you is because I can't figure out how to post a problem on this site I am only able to reply to other posts. I was hoping you could tell me how. Thanks in advance.
Itâs possible that you joined very recently and are in a way on probation. There are some requirements before a member can start discussions. Please see the threads here:
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How about a low cost solar water still using polythene bag and a water bottle? You can expect about 150 ml clean water per sq.ft. of exposed water surface in full sun light.