How Do Bees Fly ?

It has jokingly been said that engineers have proved that bees cannot fly..
It seems that such " heavy " insects with a short wing beat should not..
be able to generate enough lift..
To discover the insects' secrets, engineers..
" filmed hovering bees at 6000 frames per second, " says New Scientist..

The bees ' technique is described as " unusual."
" The wings sweeps back in a 90- degree arc,
then flips over as it returns -- 230 times a second.....
It's like a propeller, where the blade is rotating too,"
explains a member of the research team.....
Their findings may help engineers redesign propellers...
and build more maneuverable aircraft.....