Brain Teasers

1. Your last good table tennis ball fell down into a narrow metal pipe embedded in concrete one foot deep.  How can you get it out undamaged, if all the tools you have are your tennis bat, your shoe-laces, and your plastic water bottle, none of which fit into the pipe? 
2. A lotus pond has a healthy growth of lotuses. Every day the number of lotuses in the pond doubles. On the 24th day, the lotus pond was 1/2 full of lotuses. When will the pond be full if lotuses?