Some might think that controlling the weather sounds a bit like science fiction. But military pilot Alexander Akimenkov doesn't think so. He has seeded clouds over Moscow on important state holidays for many years. He says the Russians use two different methods to try to drive the rain away. Either there's a special machine that spits out silver iodide, dry ice or cement into the clouds, or a hatch opens and a guy with a shovel seeds the clouds manually," he explains. "As soon as the chemicals touch the cloud, a hole appears. It becomes bigger and bigger, and it either rains right there and then or, if the clouds aren't very dense, they disperse without any precipitation." The Russian government has used rain prevention methods since Soviet times, seeding clouds for major celebrations three times a year - Victory Day, City Day and, more recently, Russia Day. There are also private companies that for some $6,000 per hour say they can guarantee sunshine on your wedding day - or for any other private party. But when Moscow's mayor Yuri Luzhkov suggested the technique could shift the winter snow outside the capital - and therefore save more than $10m in snow-clearing costs - many felt the city authorities were going a bit too far.