Australia's Science Forum

Thanks Ocker for the tip about the nail polish. When I get the hole cleared I'll certainly dob some on to stop any sliding around.

Shas

Hi All, I'm amazed at how a simple thing can baffle me. #-o I need to repair one of the lines holding the ball in Newtons cradle. It looked like I was just going to pull out the line that was threaded through the top of the ball and replace it. Easy! When I had a closer look it seems the hole throug...

Pat's idea sounds brilliant! At my school they make crystal crowns which work really well. They cut filter paper to make a little crown ( like the kids make for Christmas plays), forming a cylinder. They make a saturated solution of salt water and then add some food colouring. Pour the solution into...

.... :? Used to do heaps of nutrient agar plates. Make a batch of couple of litres, pour 20mL into those little McCartney bottles, screw the lids on and bung into fridge. When we wanted plates, (which was every day) we'd stand the reqd amount of bottles in a saucepan with water and reheat until agar...

#-o not sure if I can remember accurately but....From another life time, i used a method to determine sulfate by adding barium chloride to water samples and a ppt formed - the higher the conc of sulfate, the denser the suspension. If the amt of BaCl you're adding is below the solubility I'm wonderin...

The teachers here like to get the students to see stomates from under side of leaves. One way is to paint the underside with clear nail polish. Let it dry then peal it away to examine under microscope. They often use rose leaves. Another way is to get a leaf like a geranium, agapanthers (or wanderin...

Another option may be soaking them in a bucket of 70% Metho for about 10minutes and allow to air dry.