I can’t remember too many stories but the one I do remember is about two kids, a boy and a girl. The boy, who's father is missing, is being bullied by the girl, who says “she’s in the wrong era” but blah blah something happens and she ends up in the basement with the boy. They find his father's time traveling machine. So the boy is reading his fathers notes and the girl is trying to figure out how the machine works. They send back a teddy bear to test it, but it doesn’t come back. But the girl wants to travel anyway and does, but the boy cries out not to do it, but she did it anyway.
It turns out that when the Father time traveled, the Earth was not in the same place that it was when he arrived back in time, leaving him floating in space. The girl end up with the same fate.