Good Riddles

Question: If 1+9+8=1, what is 2+8+9?

Question: A wise man once called me "the moist star", and in an infinite sea, I can be seen afar. I create motions in which you may ride on for sport, and am also used as a scientist's port. What am I?

Question: What four related words are merged together: TOUS RGQC URRO IAAN RLGS EEET ENE

Question: Harry, the happy hippo, happily hopped from the hippo hospital. How many h's are in this sentence?

Question: Two men/women in absolutely identical conditions have two of the exact same water bottles (full of water). An hour passes, and the temperatures of the water inside the bottles are measured. The temperature of one of the bottles is noticeably higher than the temperature of the other. Assuming that the temperature of the setting they were in, as they were both the same, had to do with the change in temperature of the water, why are they different?