This website discusses the wonders of children.  Example: “Why do birds fly in a V form?”  Students can search various wonders.  Each is offered with informational text that can be read to with the audio feature or read independently.  Pictures and separate videos are also paired with the wonder for extra information.  Vocabulary is given for every passage and a vocabulary challenge is offered to seek understanding of words.   Also, there’s an opportunity to see if comprehension of the passage was mastered.  At the end of every passage are a list of ideas and activities that go along with the topic.