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After seeing a YouTube video "hoes this app blow out candles" about an app called 'Blower' on The Action Lab I bought a copy to try it out.

The app is a simulation of a fan and the amazing thing is that it does actually blow things about. The Action Lab showed it really ould blow out a small candle but I just tried blowing some small scraps of paper and sure enough they move.

It's quite surprising and some of tne explanations suggested, "It's vibration" and so on, don't account for it. The Action Lab explains what's going on quite well.