Good Riddles

Question: My memory is good, nay, more like perfect Yet I only remember two things.

Question: what can walk on 4 when they are born, walk on 2 legs when they are older and walk on 3 when they are old uncles and aunties?

Question: Tall as a tree, dressed in white, my bridal veil is shiny bright Up all night, never sleeping: if i rest, many are weeping. Upon the shores since the days of old, my silent message what am i?

Question: Bob and Ann were found dead in a puddle of water and glass. What happened?

Question: On 20 planes I may be, but only rest on one you see. I can help you or hurt you, depending on where I lay. Because I am not the kind you use everyday