Residents in a rural area of southern Brazil were rained on by spiders this week.  Experts say it's typical in Minas Gerais state during hot, humid weather.  While it looks like the spiders are falling from the sky, they’ve actually created a huge web to catch prey.  Scientists say the parawixia bistriata species builds a community web so fine that it’s nearly impossible to see with the human eye, giving the illusion that the spiders are floating on air