Piranha teeth have the tough task of crunching bone and shredding flesh and, like well-used kitchen knives, they dull over time. Since they have no way to sharpen their teeth, piranhas lose and regrow ...

While pushing her way through "senioritis" in her final year at Denton Calvary Academy, Hannah McCain has also gone through the first part of the process to get a brand-new set of teeth. The ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to ...