Using an air-rifle in schools to demonstrate velocity of a bullet: We are wondering what rules there are around using a BB pump rifle in schools to demonstrate velocity of a bullet.

Using an air-rifle in schools to demonstrate velocity of a bullet: We are wondering what rules there are around using a BB pump rifle in schools to demonstrate velocity of a bullet.
3D printing is a relatively new technology and industry and is also one of the latest technologies to enter schools.
There are a wide range of chemicals used in solution form for various experimental activities and demonstrations in the school science curriculum.
Plasma ball: Are there any safety issues associated with using a plasma ball in the classroom? Sources on the internet seems to give conflicting information and I would appreciate some clarity.
Legalities of practical work: While I know it is not ideal, is it illegal for a science class to undertake a practical if the regular classroom science teacher is absent?
Phenanthroline: My Chemistry teacher would like to use Phenanthroline for senior chemistry EEI’s. The MSDS lists this chemical as Acute hazard category 1, and Acute toxicity oral category 3.
Sterilisation of microbiological waste: Science ASSIST has received a number of questions, which all relate to this topic, we will cover all of these in this quest
Standard Operating Procedure (SOP) and detailed method on how to handle liquid nitrogen (LN2).
When choosing a microscope consideration needs to be given to the application, skill level of staff and students and budget.
Cleaning microscope slides: What is the most effective way to clean glass microscope slides so they are suitable to reuse?
What is the usual practice for cleaning prepared slides?