The ENG Button

 "I can't change into scientific notation", say the students then they meet the ENG function on the calculator that they have never noticed before.

Protein Synthesis

 Using the molymod models to figure out how protein synthesis works. Gave the Students all the bits and got them to work out how it works. Took a while but the achievement was great and the understanding was there. Figured out I need a much bigger model.

Mixing colours

 Whilst I had the @Pasco light out and some lenses, one of itd features is it has a three colour beam and putting this into a lens made white light. A good comparison when using the prism to split up light.

Monitoring Air Pollution

 Monitoring the air pollution in the classroom, using the @ThePocketLab air. PM2.5 at 42 which is not good

sin x and sin 2x

 Investigating sin x and sin 2x and the difference it makes when you manipulate graphs. Learning patterns and why things happen before the exams.

Revision of Covalent Bonds

 @snatoms are very quick to use with revision, quickly making up molecules of Carbon dioxide to demonstrate double bonds and single bonds making up ethanol

I would choose one of these in a heartbeat

I would choose one of these in a heartbeat - the stethoscope - measuring the students heartbeat. and mine proving that I was alive and not was some of the students thought part of the living dead. Also used the electronic one so the students could hear what they were supposed to hear.