I wanted to post an update on the Time Science entry. We are still using the clock, tried a few different items in it, interesting results. We started out using water in both tubes, this kept perfect time. Well then one tube was emptied and Grape soda was added in. This actually ran ten minutes fast, and after a couple of days the soda was almost clear. Well that was switched out for mouth wash. This is actually running ten minutes behind. We are extremly interested in this (simple people we are LOL). We highly recommend trying out this time clock if you have not already gotten one.