Thursday, 24 November 2016

The Losing World





 Via:  Rainbow Tours



Using a high-speed camera, David Hu (a professor of mechanical engineering and biology at Georgia Institute of Technology) and his team bombarded Anopheles mosquitoes with drops of water and caught the resulting action at 4000 frames per second (a typical film camera only records 24 frames per second.) They found that mosquitoes are actually quite good at dealing with raindrops, even when receiving a direct hit between the wings. Mosquitoes are very light compared to the mass of the raindrop and this means the drop pushes the mosquito down rather than breaking over it. Because the drop’s speed doesn’t change very much, little force is transferred to the mosquito. Compare that with a drop hitting a larger insect, like a dragonfly; the drop would break on its back, and the resulting force would transfer into the insect’s exoskeleton. What’s more, the mosquito has hydrophobic hairs on its body and sprawling legs that create drag. This lets it slip out from under the raindrop before meeting a wet end. Via: http://www.scientificamerican.com/


 Via:  Jacob O'Neal