Hi there, I have some questions which i hope forummers can contribute or give feedback. I have given thoughts to these questions as well, and i have written them in brackets for fellow forummers to critique. 1. If wave transfer energy but not matter, why a floating bottle in the middle of the sea will drift gradually to shore? (My take on this question is that the wind plays a supporting factor. In additon, when waves break on shore, debris floating on the previously waves will get transported to shore. Wave breaking, after all, is the basis of how wind surfing works.) 2. Besides longitudinal and transverse waves, are there different types of waves? (My take on this question is no. Other than a perpendicular, parallel or even circular axis of vibration of particles, of which we will then be talking about water waves, there cant be other axis of vibrations.) 3. What makes a good sound absorber? (I understand the key concept is one of elasticity. Elasticity is not one of "stretchiness" , but rather the ability of a material that has changed shape when struck, to resume its initial shape when the striking force is removed. But still, it doesnt help to explain why rubber is a good sound absorber.I mean, rubber does go back to its initial shape right?! ) Thanks. And hope to hear your valuable comments soon.