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Ramping Up the Disappearing Rainbow with the Assassin’s Water Bottle

Tom Kuntzleman | Tue, 09/16/2025 - 09:44

What happens when chemistry and illusion collide? In The Disappearing Rainbow, a simple acid–base demonstration transforms into a spellbinding performance. With a single pour, colorless liquids bloom into a vibrant rainbow—then vanish in an instant. Now, with the arrival of the “Assassin’s water bottle,” this classic demo gets a modern twist that makes the magic easier (and cleaner) than ever.

Five for the First - Part II

Nora Walsh | Tue, 08/26/2025 - 08:44

In this, the second installment of "Five for the First", Nora Walsh shares five simple activities for the first few weeks of school to help build her classroom culture. 

Inquiry and Direct Instruction in the Age of NGSS

Dustin Williams | Fri, 08/02/2019 - 14:04

When it comes to the best approach for student learning, there seems to be two very divided camps: those who promote direct instruction and those who favor inquiry. I have been thinking a lot about this issue for several years now and decided to finally write my reflections down, based on 6 years of experience as a science teacher.