Are bacteria manipulating the weather?
Snow can be a powerful thing. It can bring a nation’s transport sys¬tem to its knees and bring out the inner child from within the most dour and life-weary soul. It is a virgin canvas wait¬ing for the imprint of an angel. It is a fluffy mound, pregnant with sculptural potential and is a fort – complete with artillery.
Most of us have seen at least a dusting of snow in the last couple of days but what caused it to fall in the first place?
You might think that snow is just what happens to rain when it gets a bit chilly but things are a lot more complicated than that.
For a start, it hasn’t been cold enough for ice to form spontaneously.
We all know that water freezes at 0C but you might not know that at temperatures above -40C or so, it actually needs a kick-start to get those ice crystals forming.