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I saw this live-action show in Canada in the early 90s; it was an "edutainment" show for kids. No idea if it was a series or a one-off. This particular episode was about space.
The characters were a bunch of kids in a clubhouse or something, accompanied by a talking computer/robot character called "W.A.L.T.E.R.". At one point in the show, Walter went crazy — he kept repeating "Walter needs more data!" and singing the phrase "dancing weightless in the sky" to the tune of "Twinkle Twinkle Little Star". He also teleported one of the kids onto NASA's Vomit Comet.
[A repost from 2011.]