What is the function of the wet paper towel placed at the mouth of the test tube in the preparation of esters?

Can lightning strike aluminum? What type of sounds do leopards make? Where is positive charge of atomic model concentrated? What action to promote a more scientific understanding of comets asteroid and meteor? Electromagnetic energy in the X ray section of the spectrum transmits through skin like light passes through? Is a flagella cell in a plant cell? How can the blending of traits cause a variation? What was Albert Abraham Michelson's experiment? A large area under one ruler? Where does the electricity in the outlets come from? What is power of torch bulb rated at 2.5v and 500m a? How do helicopter seeds dispersed? Where is Antarctica near? What is the ideal size for a pilot light in a gas appliance and how can it be determined? A chemical that inhibits DNA synthesis has yet to be found in aging cells? What elements are inert gas often made of? Is ddt a persistant or non persistant pollutant? Why do the stars glow above? Is it true that metals are attracted TO but not BY magnets? Does Saturn's season last 7.5 years?