Post provided by Jing-Chia Guo. To understand something, we often describe its appearance and shape: The ball is round, the can is cylinder, and the pillow is kind of rectangle. However, most natural creatures are irregular in shape, so it’s difficult for people to quantify or define them. Sometimes, scientists are even unable to get their hands on the objects they need, and that is … Continue reading Look inside: a handy tool for casting the enclosed nest structure of birds