Ezekiel and four horses you guys are way off topic...it was because
Darwin released his theory of evolution in 1858 AD and published it in 1859 exactly 150 years after this date is 2008 or 2009 AD. This book that Darwin published is a major sorce for disbelief in God.
If each day is a month being 30 days and if one day can be used to signify one year in Bible prophecy, as has been used by the Lord before in Numbers 14:34 and Ezekiel 4:6. then the 5 months in Revelations 9:5 would end in 2008/2009 with the return of the Lord.
The sting like a scorpion, in Revelations 9 is referring to disbelief in God or skepticism metaphorically. Of course this disbelief and skeptism will end when the Lord returns, as 'every knee shall bow'. But first there must be a nuclear war unfortunately.
What about
coconuts?