Wills and Estates

Can an Ohio court hear a will contest for a will executed and proved according to the law of another state?
I am a student and writing up an article on Ohio wills. I have a doubt- Can there be proceeding in Ohio to contest a will that was executed and proved according to the law of another state.
If my second will is destroyed, will it revive my first will?
I made a will in 2010. Later, in 2015, I made another will, revoking the one made in 2010. What I would like to know is, if my second will is destroyed, will it revive my 2010 will? I live in Ohio.
What is the law in Ohio on agreement to make a Will?
What is the law in Ohio on agreement to make a Will?
Is my will made and executed in N. Y. valid in Vermont as well?
I lived in N.Y. for about 25 years and in that time I made a will per the laws prevailing in N.Y. Now I live in Vermont with my wife and kids. Is my will made and executed in N. Y. valid in Vermont as well?
When does a will come into effect? Is it soon after death or is it after probate proceedings?
I made a will regarding disposal of my property and have deposited it with the Probate Division of the Superior Court. My children are unware of its existence and shall only be informed by my attorney after my death. When does the will I made come into effect? Is it soon after my death or is it after probate proceedings?