Unless you’re a high-schooler building a nuclear fusion reactor, the hardest part of a science investigatory project often is coming up with a good idea. You want it to be cool yet feasible, novel but still useful.

That’s why Ai-ni Bautista’s science project on making liquid soap infused with guava leaf extract is so perfect — it’s fun, easy, and fresh with a very practical outcome. This do-it-yourself soap will smell of lavender (and guava, of course) and even has health benefits for your skin.

Guava leaves contain phytochemicals that are astringent, allowing them to tone and tighten your… more

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