Please explain why battery charging via "trickling" is good for battery?

Just curious as to the science behind why trickle charging the last 20% is beneficial to the battery.
No complaint whatsoever, just curious how this works.
THanks

also
http://www.apple.com/batteries/
and
http://www.apple.com/batteries/iphone.html
PS
Congratulations on asking an intelligent question without whining. Wish all posts where like this.

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