I've been making my own laundry soap since about the beginning of the year. It's a pretty simple recipe - grate a bar of soap, add a cup each of Washing Soda and Borax, mix well, use 2 tablespoons per load. It's easy to make, with grating the soap taking the longest time.
So today I opened a new package of Ivory Soap to make a new batch. It was ... dampish. I couldn't grate it. How can I dry it? I looked up 'nuking Ivory Soap' online, and found it was a COOL thing to do. The stuff .... blooms. It would have been a GREAT part of a lesson on foams while we homeschooled.
My family and I had a GREAT time playing with the blooming bar of soap. And much to my delight, the expanded foam, once cooled, was a breeze to crush into tiny soap flakes, better than anything I'd grated for laundry soap making. I am exceedingly pleased with the results. Well, the poofy flakes go rather more airborne and made me sneeze, but that's not a big deal.