He put the burs under the microscope and found tiny " hooks" at the ends of their bristles that seemingly latched onto most any kind of fur or clothing.
To remove a brain tumor, or to clip an aneurysm, we start off by placing bur holes or small holes around the periphery of the window that we intend to make.
And back then, the planetarium, there was always not only these amazing images on the ceiling, but you could see the projector itself whizzing and burring, and this amazing camera in the middle of the room.
Then the beating begins right merrily, the burs fly in every direction, rolling down the slopes, lodging here and there against rocks and sage-bushes, chased and gathered by the women and children with fine natural gladness.
So when you're in a car and you sound the horn, usually press the middle of the steering wheel or something and go: " Bur, bur, bur, bur" , that's tooting.
Emerson put it this way : " the things taught in colleges and school are not an education, bur a means of education. " and Seneca noted that, " you should keep on learning as long as you're ignorant. "