I read somewhere that a new method of repelling mosquitoes was discovered: apparently, the creatures will not pass through certain kinds of light beams. The cause for this seems to be unknown.
When I went for a run the other day, I came across a strip of blue LED lighting integrated into the pavement – one of those features that are entirely without merit but seemingly beloved by property developers. There is something very peculiar about having light coming from below; it felt like I was approaching some kind of physical barrier, and had to exert my force of will in order to cross this line of light.