A catalyst for converting intelligence into cancerous tissue.
How is artificial rain made?  What's common to boiling water,
artificial rain and the Mentos-Diet Coke reaction? It's
nucleation! Let's see what that means.  So what is nucleation?
How does rain happen in nature? As wind passes over the sea, it
collects evaporating water as very, very tiny drops. As the wind
rises high in the air, temperatures become very cold, causing
some of these drops to merge. This bigger drop attracts more
drops of water, and so on and on. This process is called
nucleation.  When the water drops become about 0.1 mm thick,
they cannot float in the air anymore. They then fall to the
ground as rain.  Artificial rain  Sometimes it does not get cold
enough in the cloud for nucleation to occur. But if we want the
cloud to rain, we have to create places where nucleation can
occur. This is done by a method called cloud seeding.  Tiny
particles of silver iodide are sprayed on a cloud from an
aeroplane. Sometimes, solid carbon dioxid