Mitch Resnick is director of the Lifelong Kindergarten group at
the Media Laboratory at MIT. They've been at this for years.
Some of their work has been quite influential. http://web.media.mit.edu/~mres/
It's written in Flash, so it runs in your browser; you don't
need to download or install anything. It's free for all.
Keep in mind that Scratch is for the benefit of little kids,
not for big kids, and certainly not for big-name theoretical
physicists to do their research with. By way of analogy: You
don't want a tricycle, but the little kid doesn't want a racing
bike. The little kid is much better off with a tricycle. There
are limits on what you can reasonably do with it ... but it's
easy to get started.
I reckon the grade-school teachers won't get interested in this
until they see the kids get interested, so there's a bit of a
chicken-and-egg problem. OTOH there are ways of getting around
that; there are literally millions of kids who have written
code with systems like this.