The next big thing in nuclear energy is small. Designs for dozens of small modular reactors have been developed or are in progress . And a few small reactors are already operating in India, Pakistan, Russia, and elsewhere. A small modular reactor can produce up to 300 megawatts (MW) of electricity (many designs produce much less). But size isn’t the only thing that makes these new, advanced reactor designs stand out.
The human body works like a machine. Over time, its parts wear out or get damaged. For example, disease may weaken the heart or a bone may break. When the body cannot heal itself, a doctor may repair or replace diseased or broken parts to keep the body running smoothly. Sometimes, a living or dead human donor provides a part. Donations of hearts, lungs, kidneys, bone marrow, blood, and other tissues regularly save lives. But getting new parts from other human beings isn’t the only way to accomplish this.
Whenever the word “genius” is used, a small but magnificent group of names usually follows . Leonardo da Vinci and Michelangelo, Rembrandt and Raphael, Beethoven and Mozart are the automatic choices . For the modern era, two giants stand above all others: Albert Einstein and Pablo Picasso . They are in so many ways connected, especially because both of them redefined the way we consider the world we live in and both of them had brilliant new concepts of space. For Einstein, it meant the universe and man’s place in it were suddenly better known. For Picasso, the breakthrough was cubism, a way of looking at objects in space that was completely unlike any artistic vision before.
Have you ever considered what the world would look like without waste? A world free from garbage dumps, landfills and pollution? For some people, this may feel like a pipe dream given the era of consumerism and throwaway products that we live in. For others, there is great ambition and hope as the world is starting to respond to the global rise in waste, offering possible ways to address this challenge.
On a winter morning in New York City in 2017, workers tossed a duct- taped box into a garbage truck. When the truck crushed the box, it exploded. The quick-thinking workers stopped the compactor, retrieved the burning box, and tossed it in a puddle, putting out the fire.
废旧电器的归宿废旧电器的归宿——我们该如何处理那些“危险”的电子垃圾？废旧电器的归宿 Continue reading »
