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Thought this was cool, according to BBC:

Tanzania has been given permission to import rain-making technology from the king of Thailand, Thai media report.

The patented cloud-seeding technique involves aircraft releasing a chemical into clouds to induce rainfall.

How it works?

1. Aircraft or artillery spray chemicals (often silver iodide or dry ice) into clouds to encourage tiny vapour droplets to coalesce
2. Droplets of supercooled water (liquid below 0C) coalesce into snow and melt as they fall
3. Heat released as the droplets freeze boosts updrafts, which pull more moist air into the cloud

I am pretty sure this has been around for a while, had not see it mentioned in the news for a long while though!