Aspirin was discovered in 1897, and an explanation of how it works followed in 1995. That, in turn, has encouraged some research leads on making better pain relievers through something other than trial and error. This kind of discovery—answers first, explanations later—is called "intellectual debt ". We gain understanding of what works without knowing why it works. We can put that understanding to use immediately, and then tell ourselves we'll figure out the details later. Sometimes we pay off the debt quickly; sometimes, as with aspirin, it takes a century; and sometimes we never pay it off at all.

In the Age of Intelligence, while machine learning presents lots of problems and gets things wrong, at least we know enough to be wary of the predictions produced by the system and to argue that they shouldn't be blindly followed: but if a system performs perfectly (and we don't know why), then we come to rely on it and forget about it and suffer consequences when it goes wrong.

It's the difference between knowing your car has faulty brakes and not knowing: both are bad, but if you know there is a problem with your brakes, you can increase your following distance, drive slowly and get to a mechanic as soon as possible. If you don't know, you're likely to find out the hard way, at 80mph on the highway when the car in front of you came to a sudden stop and your brakes give out.

We don't have much by way of solutions. Most important, we shouldn't trick ourselves into thinking that machine learning alone is all that matters. Indeed, without life value, machine learning may not be meaningful answers at all.

If you're not at least a bit terrified by the climate and ecological breakdown unfolding before our eyes, you haven't grasped the scale of the crisis. Eco-anxiety, defined as "a chronic(长期的)fear of environmental doom", is on the rise. But redirecting this anxiety into anger and collective action might just pull humanity back from the brink.

We don't yet know how deeply eco-anxiety affects people, but we can learn not to repeat the mistakes of long-gone societies lost to environmental collapse. Jared Diamond's Collapse: How Societies Choose to Fail or Succeed uncovers the common driver that led to the fall of ancient civilizations such as the Central American Mayan, the remote Pacific Easter Island, and the Mycenae: People accidentally destroyed the environmental resources on which their societies depended.

Today, we are living in a new climate and ecological age. The new normal is one that humans have never before experienced on earth, and that has occurred within a single generation. We can't claim ignorance. Numerous scientific reports show: unprecedented(空前的)wildfires in the Arctic, heatwaves annually breaking records, the Amazon shrinking and drying, and species extinction rates accelerating. Nature's dangerous decline is unprecedented.

So, it's not surprising that eco-anxiety is on the rise. Anxiety is often a private emotional state: We feel alone, stuck inside our own heads, and our emotions stop us from doing the things we want. But anger, directed appropriately, can fuel powerful collective action for change.

We are on a pathway to destroy the global conditions for human survival. Unlike previous civilizations, we have the science and technology to understand our danger and chart a new pathway. This is a moment for all of us to channel our eco-anxiety, fear and anger into energy for change.

Playing in funfairs and theme parks is a great deal of fun, but with the fun come risks. In September, two accidents happened on funfair rides with one being killed and three injured.

Some activities and facilities in theme parks can be dangerous. Governments worldwide have ordered stricter safety checks for funfair rides, such as swing rides, roller coasters and cableways. For safety, funfair ride operators should double-check the rides and be away of any dangerous things. But passengers should do their part.

⒈ Always keep your seat belt fastened. Fasten your seat belt the moment you get on the ride and don't unfasten it until you are told to.

⒉ Stay in to stay safe. On any theme park ride, stay seated at all times, hold on to the safety bar, and keep your feet and knees inside the car. Don't stretch your body outside of the ride.

⒊ Know your limits. Read the attraction's restrictions before taking the ride. If you are not tall or old enough for certain rides, don't take the risk.

⒋ Know your health condition. Don't try any activities and facilities that are beyond your health condition.

⒌ Tell staff about any problems. If you see anything wrong — a broken seat belt, a person jumping the line, or anything else that could cause safety problems to visitors - tell the park employee immediately.

Funfair rides are fun, but they have the same safety rules as a car or plane ride. So, always put safety first for fun time.