Finches sing to eggs about climate; why do we have eyelashes; and Dunning Kruger effect

The Dunning-Kruger effect, or the know-it-all effect, makes people unaware of their own incompetence.Finches are behind some of the biggest scientific discoveries! New research shows zebra finches sing to their eggs so they can adapt to warm weather.And eyelashes, they are right there on your face? But did you ever wonder why we have them, or how they work? Finally, mechanical engineers may have the answer!