For DIY maintenance, place the blade edge-up and then glide the sharpener perpendicularly from hilt to tip three to four ...

And because they’re eating different foods, they need different types of teeth.’ Serrated teeth have a jagged edge - a bit like the blade of a bread knife. Sharks don’t chew, so this combination of ...

While a great white shark's 300 serrated teeth are an amazing hunting adaptation, what's even more amazing is their replaceability. In a lifetime, each shark can grow up to 20,000 of them.