What is cloud seeding and how does it work

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68px);max-height:100%;z-index:-1;pointer-events:none;cursor:default} .fpm-preroll_flex.fpm-show .fpm-preroll_item{z-index:3;pointer-events:all} .fpm-preroll_flex .fpm-timer, .fpm-preroll_flex .fpm-cross{top:10px!important;right:10px!important} .fpm-preroll_hover{position:absolute;top:0;left:0;right:0;bottom:0;width:100%;height:100%;z-index:2} .fpm-preroll_flex:not(.fpm-show) .fpm-preroll_hover{cursor:pointer} .fpm-hoverroll{position:relative;overflow:hidden;display:block} .fpm-hoverroll_item{position:absolute;bottom:0;left:50%;margin:auto;transform:translateY(100%) translateX(-50%);transition:all 300ms ease;z-index:1000;max-height:100%} .fpm-preroll_item [id*="yandex_rtb_"], .fpm-hoverroll_item [id*="yandex_rtb_"]{min-width:160px} .fpm-hoverroll:hover .fpm-hoverroll_item:not(.fpm-hide){transform:translateY(0) translateX(-50%)} .fpm-slider{display:grid} .fpm-slider > *{grid-area:1/1;margin:auto;opacity:0;transform:translateX(200px);transition:all 420ms ease;pointer-events:none;width:100%;z-index:0} .fpm-slider > *.fpm-hide{transform:translateX(-100px)!important;opacity:0!important;z-index:0!important} .fpm-slider > *.fpm-show{transform:translateX(0);pointer-events:all;opacity:1;z-index:1} .fpm-slider .fpm-timeline{width:100%;height:2px;background:#f6f5ff;position:relative} .fpm-slider .fpm-timeline:after{content:'';position:absolute;background:#d5ceff;height:100%;transition:all 300ms ease;width:0} .fpm-slider > *.fpm-show .fpm-timeline:after{animation:timeline var(--duration) ease} .fpm-slider > *:hover .fpm-timeline:after{animation:timeline-hover} .fpm-slider > *:after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;z-index:1;pointer-events:all} .fpm-slider > *.fpm-show:after{pointer-events:none} @keyframes timeline-hover{} @keyframes timeline{0% {width:0}100% {width:100%}} .fpm-interscroller-wrapper{position:relative;width:100%;max-width:100%;height:var(--height)} .fpm-interscroller{position:absolute;top:0;left:0;width:100%;height:100%;clip:rect(0,auto,auto,0);background:var(--background)} .fpm-interscroller + div{position:absolute;bottom:0;left:0;right:0;top:0;margin:auto;display:block;height:1px} .fpm-interscroller-inner{position:fixed;top:50%;transform:translate(0,-50%);max-width:100%;display:flex;justify-content:center;align-items:center;width:var(--width)} .fpm-interscroller-inner > div{min-width:100px;min-height:100px} .fpm-interscroller-text{position:absolute;text-align:center;padding:10px;background:var(--background);color:var(--color);font-size:14px;z-index:1;line-height:1.4} .fpm-interscroller-text.top{top:0;left:0;right:0} .fpm-interscroller-text.bottom{bottom:0;left:0;right:0}