Book/book series set in the future about an elite academy, a great inventor, a time-travel machine, and a brother and sister

Question

I read this book and it's sequel in elementary school, in fourth or fifth grade. It is a pretty recent book, and the cover of the first book features an old inventor with keys, if my memory is correct.
The book is set in the near future; somewhere between the 2030s and 2060s--maybe in the late 2040s.
There is a sister and brother who are both quite smart, and they are accepted into an elite academy. The head of the academy is an old inventor, and the siblings happen to be his grandchildren. This academy is extremely advanced; it features avatars, or cybernetic, fully constructed animals that people can connect to.
They can move the animals, and see and feel from their perspective. There is a class in the academy that uses some kind of advanced tech to construct extremely realistic images of the past, and it is based on some kind of time travel.
There is also a girl that is jealous of the siblings.
There are small white spheres containing data that are used for various purposes.
However, there is a real time travel device in the academy, and of course, there are people trying to use the time travel machine for twisted, malicious intentions.
The time travel machine is operated by keys that the teachers possess.
The book came with a trailer. I also think the book was quite popular.
Could someone tell me what this book/book series is?

Alpha · Accepted Answer

You're probably thinking of the Cragbridge Hall series, by Chad Morris - more specifically, the first book The Inventors Secret. It has a video trailer, and the cover of the book looks quite similar to what you described.

I don't have my copy of the book with me right now, but this is the description from the author's website:

Imagine a school in the year 2074 where students don’t read history, but watch it happen around them; where running in gym class isn’t around a track, but up a virtual mountain; and where learning about animals means becoming one through an avatar. Welcome to Cragbridge Hall, the most advanced and prestigious school in the world.
Twins Abby and Derick Cragbridge are excited as new students to use their famed grandfather’s inventions that make Cragbridge Hall so incredible. But when their grandfather and parents go missing, the twins must follow a mysterious trail of clues left by their grandfather. They must find out where their family is, learn who they can trust, and discover what secrets are hidden within Cragbridge Hall.
Abby and Derick soon realize they are caught in a race with a fierce adversary to discover their grandfather’s secret – a dangerous discovery that could alter both history and reality.

Book/book series set in the future about an elite academy, a great inventor, a time-travel machine, and a brother and sister

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