Some brainteasers to start

We have moved!
I hope you like it better here. I do.

What about some brain work? Give me some answers:

1-There are a few trees in a garden. On one of them, a pear tree, there are pears (quite logical). But after a strong wind blew, there were neither pears on the tree nor on the ground. How come?
2-Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins.
How can this be?
3-What occurs once in every minute, twice in every moment, yet never in a thousand years?
4-How far can a dog run into the woods?
5-What word describes a woman who does not have all her fingers on one hand?