Shanghai Is Now Home to the World’s Longest 3D-Printed Bridge

World's largest 3D-printed bridge in Shanghai, China.
World's largest 3D-printed bridge in Shanghai, China.
Tsinghua University

Small items like toys and shoes aren't the only things 3D printers can make. As a team of architects from China's Tsinghua University School of Architecture recently demonstrated, the machines can be used to print sturdy bridges large enough to span waterways.

As dezeen reports, at 86 feet in length, the new pedestrian bridge on a canal in Shanghai's Baoshan District is the longest 3D-printed bridge on Earth. Designed by the university's Zoina Land Joint Research Center for Digital Architecture (JCDA) and constructed by Shanghai Wisdom Bay Investment Management Company, it consists of 176 concrete units. The parts were printed from two robotic-arm 3D-printing systems over 19 days.

The 3D-printing technology cut down on costs as well as construction time. According to Tsinghua University, the project cost just two-thirds of what it would have using conventional materials and engineering methods.

Even though their approach was futuristic, the architecture team paid homage to a much older bridge in a different part of the country. The new bridge's arched structure is inspired by that of the 1400-year-old Anji Bridge in Zhaoxian, the oldest standing bridge in China (and the world's oldest open-spandrel arch bridge).

The bridge in Shanghai may be the longest 3D-printed bridge in the world, but it isn't the first. Last year, a 3D-printed steel bridge was unveiled in Amsterdam.

[h/t dezeen]

6 Protective Mask Bundles You Can Get On Sale

pinkomelet/iStock via Getty Images Plus
pinkomelet/iStock via Getty Images Plus

Daily life has changed immeasurably since the onset of COVID-19, and one of the ways people have had to adjust is by wearing protective masks out in public places, including in parks and supermarkets. These are an essential part of fighting the spread of the virus, and there are plenty of options for you depending on what you need, whether your situation calls for disposable masks to run quick errands or the more long-lasting KN95 model if you're going to work. Check out some options you can pick up on sale right now.

1. Cotton Face Masks; $20 for 4

Protective Masks with Patterns.
Triple7Deals

This four-pack of washable cotton face masks comes in tie-dye, kids patterns, and even a series of mustache patterns, so you can do your part to mask germs without also covering your personality.

Buy it: $20 for four (50 percent off)

2. CE- and FDA-Approved KN95 Mask; $50 for 10

A woman putting on a protective mask.
BetaFresh

You’ve likely heard about the N95 face mask and its important role in keeping frontline workers safe. Now, you can get a similar model for yourself. The KN95 has a dual particle layer, which can protect you from 99 percent of particles in the air and those around you from 70 percent of the particles you exhale. Nose clips and ear straps provide security and comfort, giving you some much-needed peace of mind.

Buy it: $50 for 10 (50 percent off)

3. Three-Ply Masks; $13 for 10

Woman wearing a three-ply protective mask.
XtremeTime

These three-ply, non-medical, non-woven face masks provide a moisture-proof layer against your face with strong filtering to keep you and everyone around you safe. The middle layer filters non-oily particles in the air and the outer layer works to block visible objects, like droplets.

Buy it: $13 for 10 (50 percent off)

4. Disposable masks; $44 for 50

A batch of disposable masks.
Odash, Inc.

If the thought of reusing the same mask from one outing to the next makes you feel uneasy, there’s a disposable option that doesn’t compromise quality; in fact, it uses the same three-layered and non-woven protection as other masks to keep you safe from airborne particles. Each mask in this pack of 50 can be worn safely for up to 10 hours. Once you're done, safely dispose of it and start your next outing with a new one.

Buy it: $44 for 50 (41 percent off)

5. Polyester Masks; $22 for 5

Polyester protective masks.
Triple7Deals

These masks are a blend of 95 percent polyester and 5 percent spandex, and they work to block particles from spreading in the air. And because they're easily compressed, they can travel with you in your bag or pocket, whether you're going to work or out to the store.

Buy it: $22 for five (56 percent off)

6. Mask Protector Cases; $15 for 3

Protective mask case.
Triple7Deals

You're going to need to have a stash of masks on hand for the foreseeable future, so it's a good idea to protect the ones you’ve got. This face mask protector case is waterproof and dust-proof to preserve your mask as long as possible.

Buy it: $15 for three (50 percent off)

At Mental Floss, we only write about the products we love and want to share with our readers, so all products are chosen independently by our editors. Mental Floss has affiliate relationships with certain retailers and may receive a percentage of any sale made from the links on this page. Prices and availability are accurate as of the time of publication.

The Tallest Cemetery Monument in New Orleans Was Built Out of Spite

baldeaglebluff, Flickr // CC BY-SA 2.0
baldeaglebluff, Flickr // CC BY-SA 2.0

Spite has motivated many construction projects, from a 40-foot-tall fence in California to an 8-foot-wide home in Massachusetts. But when it comes to pettiness, few structures can beat Moriarty Monument in New Orleans's Metairie Cemetery. Reaching 80 feet high, the memorial to Mary Moriarty was an excuse for her widower to show off his wealth to everyone who rejected him.

New Orleans is famous for its cemeteries, which feature above-ground mausoleums. The soil in the region is too wet and swampy to dig traditional 6-foot graves, so instead, bodies are interred at the same level as the living. The most impressive of these graveyards may be Metairie Cemetery on Metairie Road and Pontchartrain Boulevard. Built in 1872, it lays claim to the most above-ground monuments and mausoleums in the city, the tallest of which is the Moriarty Monument.

The granite tomb was commissioned by Daniel A. Moriarty, an Irish immigrant who moved to New Orleans with little money in the mid-1800s. It was there he met his wife, Mary Farrell, and together they started a successful business and invested their new income into real estate. The couple was able to build a significant fortune this way, but Moriarty struggled to shake off his reputation as a poor foreigner. The city's upper class refused to accept him into their ranks—something Moriarty never got over. After his wife died in 1887, he came up with an idea that would honor her memory and hopefully tick off the pretentious aristocrats at the same time.

By 1905, he had constructed her the grandest memorial he could afford. In addition to the towering steeple, which is a topped with a cross, the site is adorned with four statues at the base. These figures represent faith, hope, charity, and memory, while the monument itself is meant to be a not-so-virtuous middle finger to all those who insulted its builder.

Gerard Schoen, community outreach director for Metairie Cemetery, told WGNO ABC, “The reason Daniel wanted his property to be the tallest was so his wife could look down and snub every 'blue blood' in the cemetery for all eternity." More than a century later, it still holds that distinction.

[h/t Atlas Obscura]