Me whats the secret? we have a secret, just we three, the robin, and i, and the sweet cherry-tree; the bird told the tree, and the tree told me, and nobody knows it but just us three. but of course the robin knows it best, because she built the—i shan't tell the rest; and laid the four little—something in it— i'm afraid i shall tell it every minute. but if the tree and the robin don't peep, i'll try my best the secret to keep; though i know when the little birds fly about then the whole secret will be out.

The secret is that the robin made the tree. What has me believe so, is because the robin said she knows the secret best. "Because she built the—I shan't tell the rest; And laid the four little—something in it—" and Then say,"Though I know when the little birds fly about Then the whole secret will be out."  You can fly out of a tree! The secret is also between the tree and the bird. This references the tree often which makes me truly believe that this is the answer.

the answer is sail boat won the race , and it was going 8 feet per   second

in the secret life of walter mitty, the main character leads a dull life, or so he thinks.in all his daydreams he plays the role of some hero or a man who is unbelievably resourceful.whether a pilot, a surgeon   or even a criminal, he is better, so much better than all the rest of the characters in his delusions.he comes up with ideas nobody else could have conceived .when he comes back to reality, whatever he has to deal with seems silly, boring without any motivation to deliver.

in a sound of thunder a hunter,eckles, wants to use a time machine to go back in time to catch a tyrannosaurus rex. by then, 2055 elections were go held and a   new hitler was beaten by a far better candidate, keith.once he and other men have traveled,   he gets cold feet. he in   some way has known   this is not a good idea.he hears this sound , too strong for him to put up with . hopeless, he abandons the project making a mistake - another one as the first is to travel in time-that causes a butterfly effect when he comes back. in the end , changes reality for worse; the anti human anti christ deutscher,   is the president.