This Things of Science unit came with a few small inexpensive noise-makers (small bell, whistle, etc.) and a few things for making simple instruments (rubber band, plastic tube). This is a unit where perhaps the booklet is a good deal better than the things.
Another eBay purchase that came only with the booklet. I think though someone interested in recreating this unit could improve upon the “things” that originally came with it anyway (no doubt size constraints — having to ship the things in the mail — limited what the Things of Science could provide).
Dies Iræ is a Latin hymn describing the day of judgement. The first line is as follows:
Dies iræ, dies illa
Since used in the hymn, the first few notes of Dies Iræ have appeared in a lot of music, especially movie soundtracks, from TheNightmare Before Christmas to It’s a Wonderful Life to Star Wars: A New Hope. Once you hear it, you’ll start noticing it everywhere. This video gives a history of Dies Iræ, from classical music to modern movie soundtracks.