Precipitation reaction (sodium hydroxide and barium nitrate): I wonder if you can help me out with another confusing chemical reaction we have observed in our lab.

Precipitation reaction (sodium hydroxide and barium nitrate): I wonder if you can help me out with another confusing chemical reaction we have observed in our lab.
Banned chemicals/materials list NSW & ACT: Hi there, I have heard that schools in NSW & ACT have updated their list of banned chemicals and materials for use in Science.
Dust at workplace: Good afternoon Science ASSIST.
What types of microorganisms are suitable for use in Australian school science laboratories?
Tarantula kept in classroom: Is it perfectly okay to keep a tarantula in a locked container in the classroom?
Classification and storage of nitrates: While updating Safety Data Sheets (SDSs), I found some confusing changes in the listing of some nitrates.
Fume cupboard plumbing. We are about to install a fumehood and the question has come up about its plumbing. Can it be plumbed into the normal waste water / sewer lines or is something else needed?
GHS Signage: Flammable Liquids and Corrosives cabinets.
Year 12 Biology (Rennet). Dear Sir or Madam, I am just wanting to source Rennet for Yr 12 Bio experiments. We have previously used 'Simply Junket' powder, which is now very expensive.
Australian Standards for window coverings in science labs: Good morning, We need to replace the window coverings in our labs.