<

Help Rid New York Of Its Unjust 'Gravity Knife' Law

In the last 10 years, 60,000 people in New York have landed in jail due to a ‘50s-era law banning “gravity knives,” the vague definition of which allows police and courts to prosecute people for carrying virtually anything sharp. 86 percent of those jailed were black or latino. And now you can help repeal it. » 6/24/15 7:57pm 6/24/15 7:57pm

Making a knife from a chunk of concrete and an old shovel

Fashioning beautiful weapons from found objects is always so fascinating to see. How does a person look at a chunk of concrete and see an elaborately detailed knife handle? How can we turn a piece of a shovel into a really sharp knife? Watch John Heisz work his magic below. There are a lot of satisfying noises that… » 6/12/15 6:45pm 6/12/15 6:45pm

Watch a super hydrophobic knife cut through a water droplet

Black magic and sorcery and deals with the devil and breaks in The Matrix and possibly other dimensions. That's what super hydrophobic material is made out of. Like this super hydrophobic knife that just slices through a water droplet and cuts it in two. Are we really sure science can explain what my eyes are seeing? » 1/30/15 9:42pm 1/30/15 9:42pm

The cutting edge of a knife is totally invisible to the naked eye

That's a red blood cell on top of a knife's cutting edge. Now, we know we can't see a red blood cell with our naked eyes. It's too tiny. But we think we can see the cutting edge of a knife because it's there in front of you, right? No, you can't see it. To your eye, it's invisible, as Nikola Slavkovic explains in… » 12/23/14 8:34pm 12/23/14 8:34pm

The hypnotizing process of making a handmade steel knife

Damascus steel is a Middle Eastern type of steel famously known for its resilience and distinctive patterns. Its secret was a unique forging technique that has been long lost. Nowadays experts try to reproduce it and, while it may not be exactly the same process, watching them doing it feels like magic. » 12/02/14 6:49pm 12/02/14 6:49pm