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Joe Wolf via Flickr // CC BY-ND 2.0

What’s Actually Used as Dirt on Rooftop Farms

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Joe Wolf via Flickr // CC BY-ND 2.0

With more people moving to cities than ever before, many are looking to urban farming as the future of sustainable agriculture. But growing crops in the city isn’t as simple as dumping soil on a rooftop and planting some seeds. If farmers were to use real dirt in their rooftop gardens, they’d likely end up with dead plants, leaks, soil compaction, and in extreme cases, ceiling collapse. 

That’s why instead of dirt, rooftop farmers cultivate their crops in something called “growing media.” This futuristic-sounding soil substitute is carefully engineered to mimic the properties of natural dirt and improve them as well. It’s made from a blend of minerals and organic matter, which could include rice hulls, ground coconut husks, pumice, or sand. 

Annie Novak, co-founder and farmer of Brooklyn’s Eagle Street Rooftop Farm, tell Atlas Obscura that compost blends can vary greatly. The growing media she uses at her rooftop farm is made from mushrooms, peat moss, and additional components like perlite (a mineral made by air-puffing volcanic glass) and vermiculite (a mineral particulate).

In order for growing media to be suitable for rooftop gardening, it must first pass a strict set of regulations. In addition to not containing any organic soil, all growing media must be sterile, stable, and capable of properly retaining and draining water while providing enough air for the plants to breath. Nutrients, salt content, and pH levels must all fit specific criteria, and most importantly, the growing media needs to be heavy enough to resist wind and water while not so heavy that it compromises the structure of the roof. 

Today there are only six rooftop farms in New York City, but there's plenty of potential for the city's future. In just New York City alone, there are approximately 1 million buildings with a total of 38,256 acres of roof space. That's a lot of rooftops waiting to be filled with fake dirt. 

[h/t: Atlas Obscura]

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Tokyo Tops List of Safest Cities in the World, New Report Says
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When choosing a city to call home, some might weigh factors like affordability, potential for job growth, and even the number of bookstores and libraries. But for many aspiring urbanites, safety is a top concern. This list of the world’s safest cities from the Economist Intelligence Unit (EIU) proves you don’t need to trade your sense of welfare for the hustle and bustle of city life—especially if you're headed to Tokyo.

As Quartz reports, the EIU assessed the overall safety of 60 major cities using categories like health safety, infrastructure safety, personal safety, and the cybersecurity of smart city technology. With an overall score in 89.80 out of 100 points, Tokyo is the 2017 Safe Cities Index's highest-ranking city for the third year in a row.

While it was rated in the top five places for cybersecurity, health security, and personal security, Tokyo's No. 12 spot in the infrastructure security category kept it from receiving an even higher score. The next two spots on the EIU list also belong to East Asian cities, with Singapore snagging second place with a score of 89.64 and Osaka coming in third with 88.67. Toronto and Melbourne round out the top five. View more from the list below.

1. Tokyo
2. Singapore
3. Osaka
4. Toronto
5. Melbourne
6. Amsterdam
7. Sydney
8. Stockholm
9. Hong Kong
10. Zurich

You may have noticed that no U.S. cities broke into the top 10. The best-rated American metropolis is San Francisco, which came in 15th place with a score of 83.55. Meanwhile, New York, which used to hold the No. 10 slot, fell to No. 21 this year. The report blames the U.S.'s poor performance in part on America's aging infrastructure, which regularly receives failing grades from reports like these due to lack of maintenance and upgrades.

Surprised by your city's rank? For an idea of how other countries view the U.S. in terms of safety, check out this list of travel warnings to foreign visitors.

[h/t Quartz]

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History
In 1909, a Door-to-Door Catnip Salesman Incited a Riot in New York
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In 1909, New York City businessman G. Herman Gottlieb was looking for a way to make a quick buck. He found it in a wooded section of Northern Manhattan, where wild catnip grew. After harvesting two baskets full of the plant, Gottlieb headed downtown to Harlem, intending to sell the product to residents with pampered felines.

As the history blog The Hatching Cat recounts, what Gottlieb didn’t know was that the neighborhood was also home to plenty of feral cats with voracious appetites. As Gottlieb made his way around the neighborhood, a handful of stray cats seized upon some leaves that had fallen out of his basket and began writhing and rolling around on the ground. Soon, even more kitties joined in, and “jumped up at his baskets, rubbed themselves against his legs, mewing, purring, and saying complimentary things about him,” according to an August 19, 1909 article in the St. Louis Post-Dispatch.

Gottlieb tried to frighten the cats away, according to The Washington Times’s account of the event, but the persistent animals wouldn’t budge. “All of them, rich and poor, aristocrats from the sofa cushions near the front windows and thin plebians from the areaways struggled mightily to get into the two baskets of catnip,” the Times wrote. Soon, Gottlieb found himself surrounded by somewhere between 30 and 40 cats, each one of them clamoring for his goods.

When he eventually spotted a policeman, Gottlieb thought he’d found an ally against the cats. Instead, Sergeant John F. Higgins promptly arrested Gottlieb for inciting a crowd. (“Why don’t you arrest the catnip?” Gottlieb asked him, according to the Times. “That is collecting the crowd. Not I.”)

Trailed by several cats, Higgins and Gottlieb made their way to a police station on East 104th Street. But when they arrived, authorities couldn’t decide whether or not the salesman had actually broken any laws.

“We can’t hold this man,” Lieutenant Lasky, the officer who received the arrest report, said. “The law says a man must not cause a crowd of people to collect. The law doesn’t say anything about cats.”

“The law doesn’t say anything about people,” Higgins replied. “It says ‘a crowd.’ A crowd of cats is certainly a crowd.” Amid this debate, a station cat named Pete began fighting with the invading felines, and, with the help of some policemen, eventually drove the catnip-hungry kitties out of the building.

Gottlieb was eventually released, and even driven home in a patrol wagon—all while being chased by a few lingering cats, still hot on the trail of his now regrettable merchandise.

[h/t The Hatching Cat]

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