Welcome to Edinburgh, the world's leading festival city.

Edinburgh International Science Festival

Time: 6 April to 20 April

Edinburgh International Science Festival, founded in 1983, is the world's first public science festival. The two-week festival gives audiences amazing experiences through a diverse program of inspiring events. Alongside the annual festival in Edinburgh, the organization has a strong focus on education and runs a touring program that visits schools around Scotland throughout the year.

Edinburgh International Book Festival

Time: 10 August to 20 August

Edinburgh International Book Festival is the largest public celebration of the written word in the world, which was first held in 1997. Every August around 1,000 writers and thinkers from across the world gather with the audiences in Edinburg. Here book lovers can rub shoulders with world-renowned authors --- or just relax in the sunshine with a deckchair, a drink and a favorite read.

Scottish International Storytelling Festival

Time: 19 October to 31 October

Beginning in 1989, the Scottish International Storytelling Festival is the largest storytelling event in the world. Drawing heavily on traditional tale-tellers from Scotland — as well as international guests with stories from their own cultures, the festival is a very special celebration of the oral tradition. Skilled storytellers draw their audiences in, bringing together past and present, real and unreal, for an attractive 10 days.

Edinburgh International Children's Festival

Time: 25 May to 2 June

Edinburgh International Children's Festival is the one dedicated specifically to children. It brings some of the world's best theatre, dance and plays made for young people to Edinburgh for nine days of inspiring and entertaining shows and special events. The Festival began in 1980 and is now spread over 10 activity fields, attracting a loyal audience of 10,000 families, schools and artists.

A few weeks ago, I bought a locally-grown salad from a vending machine(自动售货机). But then I immediately realized that it was packaged in a plastic jar. ''I guess I live with this jar now and forever. '' I thought sadly as I stared down at my new child.

The salad jar was only the latest in a long line of examples of how I am addicted to the responsibility of reusing everything, trying to never throw anything away. Water bottles have been given second lives, and berry containers are transformed into Tupperware. I recently even looked at a plastic straw in my fruit juice: Could I reuse it too…?

Yet trying to squeeze my salad jar under my kitchen counter this weekend, I finally had to admit: Being an environmentalist has turned me into a hoarder(囤积者). While keeping a certain number of jars and vegetable bags will allow me not to buy new containers, at a certain point those 30 berry containers begin to get a bit unnecessary. Who am I kidding? Then one day I came across a blog post that asks accusingly. ''Are you turning your own home into a landfill(垃圾填埋场)? ''

In my defense, there is absolutely no excuse not to be a conscious consumer. The solution is painfully obvious, but hard to admit: Delaying waste is not, in fact, rejecting waste. In an over-packaged, over-consuming culture, this can feel like a burden. While I refuse to throw away packaging, the fact remains: I already have it. The damage is done. I've been ignoring one of the most essential and difficult parts—reduce, reuse, recycle. Even if I go out of my way to reuse the waste I do have, I need to reduce what I am bringing home in the first place.

While I might not be ready to go full zero-waste, it's a goal that is admirable to work toward. Until then, my salad jar child is going to make a great overnight oats jar.

The new garbage sorting regulation has taken effect in Shanghai starting July 1. Many citizens are still confused about the classification of the four different types of trash. Thankfully, authorities have released an official guideline to clarify the new rules.

The guideline, published by the Shanghai Greenery and Public Sanitation Bureau, provides a rather clear definition on the four kinds of waste: recyclable waste, hazardous (有害的) waste, household food waste and residual (剩余的) waste.

Hazardous waste, as the name suggests, includes assorted poisonous materials like used batteries, light bulbs, out-of-date medicines, paint and pesticides.

Household food waste, which is translated to “wet trash” in Chinese，refers to food leftovers, rotten food, pet food, fruit peels, remains of TCM herbs (中药) and flowers.

Paper, plastic, glass, metal and textiles (纺织品) are counted as recyclable waste.

The definition of residual waste is a little confusing. Anything that is not listed above belongs in this category.

As specific as the new guideline is, residents still have a hard time sorting trash correctly and are finding it challenging to memorize them all. For instance, both plastic bottles and bubble tea or coffee cups are plastic materials. However, the former falls to the category of recyclable waste and the latter belongs to residual waste. To save the hassle, some netizens have come up with their own ways to sort trash.

“We should do this from a pig’s angle,” commented one netizen. “Those edible (可食用的) for pigs are household food waste. Those even pigs don’t want to eat are residual waste. If a pig consumes something and dies of it, then something must be hazardous waste. Those which can be sold and the money we gain can be used to purchase pigs are recyclable waste.” The new regulation has gone into effect on July 1. Those who do not sort their trash properly will be fined RMB200.

Smart cities are coming. And you can be sure that hackers(黑客) won’t be very far behind.

We’ve already gotten a glimpse of that future, as cities across the globe start to use technology to connect their services and residents in ways that was science fiction just a few years ago. They are using sensors to collect data — such as traffic, garbage collecting, and road conditions —and then using that data to deliver services to more people and more efficiently.

But this rush to become a smart city has a major drawback: The more connected a city is, the easier it is to cyber-attacks. Hackers have, in recent years, effectively held cities hostage through ransom ware(赎金器), sometimes damaging critical systems for months at a time. The damage can cost millions to repair, as Baltimore and Atlanta have discovered.

And this is just the beginning. As cities add connectivity to their streetlights, power grids, dams, transit lines and other services, they are adding more targets that have the potential to be hacked. What’s more, as additional information on residents is collected, officials worry the result —lots of data could attract nation-states or terrorists who could incorporate the data into physical and cyber war.

What cyber security lesson can’t be taught in this hack? For example: Don’t open email attachments from unfamiliar sources; don’t click on unrecognized links; don’t leave sensitive information visible on the walls or surfaces of your office. But let’s just stick to the most important lesson: The information you share on social media can be used to profile and target you, whether that’s by engineering click bait(点击诱饵) aimed at your particular interests, guessing your password based on your birthday or figuring out your schedule and travels so that an intruder can access your home or office.

Wednesday, September 18, 2019 THE WALL STREET JOURNAL.