Radon: A literature search for answers – submitted by Dave Gervais

The following article provides the results of a literature search of radon and its hazards of particular interest to high school science teachers.  The article was written by Dave Gervais, chair of STAO’s Safety Committee. Continue reading

Using a Van de Graaff generator – YouTube

From the Institute of Physics and the National STEM Learning Centre and Network (https://www.stem.org.uk/), this video is aimed at teachers and shows how to get the best out of a Van de Graaff generator. In the video, Michael de Podesta explains how the generator works and gives some tips on getting consistently good results when using the apparatus. The video concludes with a simple but effective demonstration of charge.

Making Liquid Nitrogen From Scratch! – Veritasium

Making liquid nitrogen is hard – in fact up until 150 years ago scientists doubted whether it was even possible to liquefy nitrogen. In 1823, At the royal institution in London, Michael Faraday first produced liquid chlorine, kind of accidentally by putting it under high pressure. He similarly liquefied ammonia. Continue reading

Scientists may have detected a black hole devouring a neutron star | CBC News

First, astronomers made history when they detected a gravitational wave from two black holes merging. Then it was two neutron stars. Now, astronomers believe they’ve detected a gravitational wave coming from another first-time discovery: a black hole swallowing a neutron star.

Source: Scientists may have detected a black hole devouring a neutron star | CBC News

Why white horses aren’t bothered by horse-flies – submitted by Joanne O’Meara

Susanne Åkesson, Professor of Evolutionary Ecology at Lund University in Sweden, has been awarded the prestigious Ig Nobel Prize. The prize, which she shares with six other researchers from Hungary and Spain, was presented to them for their discovery that white horses aren’t particularly bothered by blood-sucking horse-flies. Continue reading