Imagine that you are preparing a project with your friend. You have found some interesting material for the presentation and you want to read this text to your friend. You have 1.5 minutes to read the text silently, then be ready to read it out aloud. You will not have more than 1.5 minutes to read it.
Until fairly recently, it was a mystery how certain large bees, bumblebees in particular, were able to fly. To scientists who study the physical laws of flight, a bee’s body seemed too heavy and its wings too small for it to become airborne and remain so. Bees “can’t” fly … but do. The mystery became so intriguing that a few scientists decided to study it.
Most insects fly by using muscles that flap their wings with great speed. For example, the locust beats its wings at a rate of about 20 times per second to fly. Other flying insects have to beat their wings even faster – some as rapidly as 100 times per second.
But bees must work extra hard to become airborne. Honeybees, for instance, must beat their wings about 200 times a second to fly. Yet larger bees – like bumblebees – whose bodies are heavier, wider, and longer – have to do even better.