hey, here's a really simple explaination of what i've been told about falsetto.

When ever you do something "weird" or "unnatural" with your voice it usually means that the vocal chords are in a different possition than just normally singing. in falsetto singing, the vocal chords appear to be almost flipping inside out. this does occur in all men, regardless of whether or not they know how to control it. it is possible for women to have a falsetto, and these are called whistle tones. they are so high they're practically useless. A rough equivalent for women would be their belting voices, which is "the chest voice" and in this instance, the vocal chords are pushed far forward.