Probability

 Maths is having fun with the dice tower and 120 dice trying to see if more dice gives the 1/6 ratios, or whether 1200 dice was better. Conclusion we needed to go much bigger - very much bigger

Locktronics is an electricity winner

 So easy from diagram on the board to a completed and working circuit using Locktronics from @MatrixTSL The students can seem to get through twice as many experiments in the time and more importantly with greater understanding

Ready to do a titration

 I have started using automatic dispensing pipettes with the students when setting up titrations. Why use the pipettes with a bulb when the students aren't good with them and use these which are more accurate and faster.

yeast bubbling

 Anaerobic respiration demonstrated by yeast making carbon dioxide in some orange juice and in bread

Proving the theorems

 Sometimes knowing the theorem is not enough. You have to be able to prove it and justify the facts to be true.

Rotaflow or not

Carrying out a titration, I gave the students the choice of different types of burettes. I showed them how they worked and then they all chose the straight ones rather than the Rotaflow design.

Failed experiment

Investigating catalysts. The student was so slow in lighting the spill the experiment was over before he was ready - we had to do it again after this.