What is sound? Well, if I wave my hand about in mid air I'm pushing some of the air around, creating pressure waves that radiate outwards like the ripples on a pond at over 700 miles per hour.
In the absence of prior expectation of their differences, many sensory stimuli get categorised in our minds as the essentially the same.
How does one learn to exercise naive attention? It's an experiential thing, rather like learning to dance or ride a bicycle.
I heard the other day (November 2010) that one of our British universities has set up a "DNA archive of endangered species". The plan as I understand it's to store the DNA in a freezer until, at some time in the future, clones can be created to replace animals that have become extinct.
It's recently (October 2010) been announced here in Britain that the government is considering legislating for permanent "Summer time", with a view to "double Summer time" in the near future. I say - let's not.