The social purpose of the copyright system is to encourage creativity and the advancement of knowledge by giving those who make intellectual (智力的) contributions a “unique right to their writings and discoveries” for limited times. Protection is provided for a much longer time for copyrights than for patents. The U.S. Copyright Law of 1976 provides a term or the lifetime of the author plus 50 years. It recognizes that the value of written works often extends over a longer time than that of technological advances in the public area.

It is essential to register for formal copyright protection in order to have some degree of protection against the copyright of one’s works by others. The procedure for obtaining a copyright registration is quite simple—an application is submitted with a small fee and two copies of the work. No examination is made, and the copyright is immediately in force.

The Copyright Office will provide on request a variety of leaflets (小册子) describing the procedure and giving information about the classes of subject matter that can be registered.

You can contact the Copyright Office (wwcoprightfice.org) for more information.

People have come to understand the enormous impacts-beneficial as well as harmful- plastics have on human lives and the environment. As polymer (聚合物) scientists committed to inventing sustainable solutions for real-world problems, we set out to tackle the issue of plastic waste by rethinking the way polymers are designed so we could make plastics with recyclability built right in.

Everyday items including milk jug, grocery bags, and takeout containers are made from a class of polymers called polyolefins. These plastics are really durable (耐用的) because the chemical bonds in those polymers are extremely stable. In a world set up for disposable (一次性的) items, durability is no longer a design feature but rather a design drawback. Imagine if half the plastics used today were recyclable through twice as many processes as they are now. Also conventional recycling requires careful sorting of all the collected materials, which can be challenging with so many different plastics. For example, separating paper from metal doesn’t require complex technology, but sorting a container from a milk jug of a different polyolefin is difficult to do without the occasional mistake.

In a study published in Science in October 2023, we described a series of polymers with only two building blocks-one soft polymer and one hard polymer-that behave like polyolefins but could be chemically recycled. Connecting two different polymers multiple times until they form a single, long molecule (分子) creates what’s called a multiblock polymer. By changing how much of each polymer type goes into the multiblock polymer, our team produced a wide range of materials with properties that covered all polyolefin types.

Using the same strategy but by adding hydrogen, we could disconnect the polymers back into their building blocks and easily separate them to use again. When we made new polymers out of these recycled plastics, they performed just as well as the original materials even after several rounds of chemical recycling. So we were able to create materials with similar properties of the plastics the world relies on. We believe this work is a step toward more sustainable plastics.

In recent years, aggression on social media have become commonplace. More than half of the victims said they didn’t know the identity of the perpetrator (作恶者). Most people agreed that the anonymity (匿名) of the Internet provides cover for nasty and harassing (骚扰) behavior.

Does this growing aggression on social media give us a glimpse of our real human nature? Are we-at our core-aggressive beasts? It’s true that hate crimes are on the rise, and political divisions app ear to be growing. The level of public bitterness-especially online-is substantial. But I don’t believe that’s because social media has unlocked our cruel human nature.

As an evolutionary anthropologist, I have spent years researching our transformation as a species. Over the past two million years, we have evolved from groups of apelike beings armed with sticks and stones to the creators of cars, rockets, and nations. Our bigger brains have allowed us to bond and cooperate in more complex and diverse ways than any other animal. Meanwhile, “you are whom you meet.” How we perceive, experience, and act in the world is shaped by who and what surround us on a daily basis. This process has deep evolutionary roots and gives humans what we call a shared reality.

I would argue that the rise in online aggression is a product of our evolutionary social skills, the social media boom, and the specific political, economic and social context where we find ourselves. This explosive combination has opened up a space for increasingly more people to fan the flames of aggression and insult online. Aggressive behavior-especially to those you don’t have to confront face-to-face-is easier than it’s ever been. And for the aggressor, there are often no consequences.

Yes, it seems that the world is getting more aggressive, but that’s not because we are more aggressive at our core. It’s because we haven’t been standing up against bullying, abuse, and aggressive harassment, and promoting pro-social attitudes and actions our contemporary world demands. In person and on social media, we must do both.