All human societies play games．Kicking a ball can be found everywhere whether just a ball of cloth，or a skin stuffed with feathers or air．

But complex games and team sports have tended to arise in big civilizations - the higher the cultural level of a society，the greater the complexity of interaction，and hence perhaps the more complex the forms of sport．

This is not always the case．The ancient Greeks，for example，preferred individual not team sports．But in China for well over 2，000 years，people played the game of “kickball” - cuju．The members were often young men from wealthy families though there were also professional kickballers，whom you could stick with in your team as sleepers．

Cuju was played as entertainment at court banquets or the reception of foreign ambassadors．Even emperors played kickball．

As you'd expect in a Confucian society，kickball clubs were keen on the key qualities of mercy and courtesy．A great player was one who showed “the spirit of the game”．The “Ten Essentials of Kickball” included respect for other players，polite behaviors and team spirit．There was to be no ungentlemanly behavior，no dangerous play，and no hogging（独占）the ball．In other words，as we used to say，“play up and play the game．”

What a contrast with the ancient Greek athletics where only victory counted and if that needed gamesmanship，or cruel professional fouls（犯规），then so be it．

As a way of national culture protection，cuju was listed into the first batch of China's intangible cultural heritages（非物质文化遗产）in 2006．

Cyber-security firm Lucideus Tech has launched Safe Me，a cyber risk assessment app with versions aimed at regular users，enterprises and their senior executives．

“Our ‘Safe’ product，which we launched three years back，provides the cyber risk status for your organization，all the way down to every single laptop，every single router（路由器），every database，every cloud instance，” said Saket Modi，co-founder and CEO of Lucideus Tech．

When a regular user opens the “Safe Me” app，they will see a score has been given to them about their cyber-safety risk．The ratings are from zero to five；the lower the rate，the higher the risk．The app also does a risk assessment for the device，and highlights if the user needs to update the OS（操作系统），if the device is secure，etc．It also shows the user a list of damaged passwords which is linked to their email ID，including the password that got leaked．

Modi says the app will remain ad-free and it does not require any special permissions in order to show this risk assessment．The app will also let regular users take safety courses to improve their safety score．The more tests one answers in a correct way，the better their score becomes．

Enterprises on other hand will be able to design and run their own safety campaigns in order to improve the security risks of their employees．“Even today，the largest of the Fortune 500 companies around the world don't have any personalized module for cyber-security protection of their employees．So what we are trying to do with Safe Me is give you a personal assistant，and you can count on it when it comes to knowing your own cyber-security risk status，” he said．

Modi pointed out that with COVID-19 pandemic（流行病）and more employees working from home，the difference between professional workspace and personal space has disappeared．“So our application can give users and employees first hand visibility of their own risk status．” he added．

More than 45，000 years ago，by the shore of present-day Tasmania，a local person picked up a large piece of thick，dark brown seaweed．And he realized that this giant piece of seaweed could be used to make a watertight bag．And 45，000 years later on mainland Australia，people are again turning to seaweed to solve pressing problems．Today，it is used to address the world's climate crisis．

Winberg，a marine ecologist at the University of Wollongong，has spent decades studying seaweed．She believes seaweed's fast growth rate and ability to absorb vast amounts of carbon dioxide can help fight climate change，de-acidify（降低酸度）the oceans，and change the way we farm，not just in the oceans but also on land．

“If we used the infrastructure we have in the ocean and created seaweed islands，we would actually get rid of many climate change issues we have today，” says Winberg．Realizing seaweed's potential as a climate solution，Winberg opened Australia's first land-based，commercial seaweed farm in 2013．On her farm in New Wales，Winberg produces seaweed extracts（提取物）that are used in food，cosmetics and medicines

Like plants on land，seaweed absorbs CO₂ and grows biomass（生物量）．Coastal marine systems can absorb carbon at rates up to 50 times greater than forests on land，according to Emily Pidgeon，senior director of strategic marine initiatives at Conservation International．Globally，seaweeds are thought to absorb nearly 200 million tons of CO₂ every year - as much as New York State's annual emissions．And when the seaweed dies，much of the carbon locked up in its tissues is transported to deep oceans．

By raising pH levels in the ocean，seaweeds also improve growing conditions for shellfish such as oysters and mussels，whose shells become more fragile（脆弱的）in acidic environments．

The potential for seaweed cultivation doesn't stop in the oceans．Winberg has found there are benefits to doing it on land too．She believes that seaweed farming offers “huge potential” to not only address the climate crisis，but also feed a growing population in a sustainable way．According to Winberg，one hectare（公顷）of a seaweed farm can produce more protein than the same amount of land used for cattle．“We're sitting on undiscovered，renewable，sustainable resources，” she says．