Fulgurites are glass tubes formed when lightning strikes a desert or beach. Artificial fulgurites are made by running a high-voltage arc through a tub of sand.
I started searching for fulgurites this morning after being reminded of a hoax image that went around last year. It purported to show a massive fulgurite on a beach but was, instead, a stick covered in wet sand. But, as Kyle Hill wrote at the But Not Simpler blog last July, the hoax doesn't make real fulgurite any less awesome.
Incredibly, lightning can and does in fact create something amazing when it hits sand, but the conditions have to be perfect. When it hits a sandy beach high in silica or quartz and the temperature goes beyond 1800 degrees Celsius, the lighting can fuse the sand into silica glass. The blast of a billion Joules radiates through the ground making fulgurite—hollow, glass-lined tubes with a sandy outside. Petrified lightning.
When the lightning perfectly strikes the sand, it branches through it like the root system of a tree to make this beautiful anomaly. But that simple fact is key to getting to the root of the viral photo: The lightning creates a tube of glass through the ground, not above it. You can actually see the impact hole when it occurs in rock.
Where are our petabyte drives? Brian Hayes takes us through the reasons storage is “stuck” in the low terabytes. The tl;dr is that we got such exceptional capacity growth in the late 90s and early 00s we don’t need much more right now, so the focus since then has been on SSDs, networking, interfaces, etc, […]
Amélie Lamont, a former staffer at website-hosting startup Squarespace, writes that she often found herself disregarded and disrespected by her colleagues. One comment in particular, though, set her reeling — and came to exemplify her experiences there.
In this episode of the Flash Forward podcast we travel to a future where humans have decided to eradicate the most dangerous animal on the planet: mosquitos. How would we do it? Is it even possible? And what are the consequences? Flash Forward: RSS | iTunes | Twitter | Facebook | Web | Patreon We […]
Some truths are universal. For one, your phone will always run out of power when you most need it. For another, the charging cords that come packaged with your Apple device will fray, split, and rip faster than Usain Bolt in a game of tag.Instead, pick up a charging cord that anyone would have a tough […]
Some people say magic tricks are nerdy and best left to your 12-year-old asthmatic cousin. But others see value in perfecting the slight of hand and showmanship associated with a perfectly executed routine. We’re firmly in the latter camp. And now, we’re giving you the ability to put a few parlor tricks up your sleeve with the Penguin […]
Bluetooth speakers may be convenient to use, but many of them just aren’t that powerful. Sure, it may be fine if you’re seated in front of the speaker. But move across the room, and you may strain to hear what’s coming from those tiny drivers.There’s a reason why the G-BOOM Wireless Bluetooth Boombox (now $79.99 in the Boing […]