Make Sushi 1. Get an Extremely Sharp Knife with This Method. Posted: March 24, 2025 | Last updated: March 24, 2025. Master the art of sharpening a knife with a wet stone and achieve a razor-sharp ...

You can use a stone, belt sander, or fixed-angle system for these heads. The most challenging part will be keeping a steady angle while making your passes on the stone or belt. I recommend everyone ...

When monkeys in Thailand use stones as hammers and anvils to help them crack open nuts, they often accidentally create sharp flakes of rock that look like the stone cutting tools made by early humans.

Sharp stone technology chipped over three million years allowed early humans to exploit animal and plant food resources. But how did the production of stone tools -- called 'knapping' -- start?