1]What do u mean by:

Question

Philosopher's wool
2]what will happen if door of refrigerator is open
3]How can we increase life of Daniel cell?

Answer 1

1. I never heard of it but according to this dictionary link it is zinc oxide.
http://www.ask.com/dic?q=philosophers'+wool&o=0&l=dir&page=1

2. The refrigerator will get warm. The electric bill will increase because the refrig will run longer. Surely you ask in jest.

3. Less current can be drawn from the cell is one way. Another is to increase the concentrations of the solutions.