1. After Stephen Hawking was diagnosed with ALS, his doctor told him that
Correct!Wrong!
After Stephen Hawking was diagnosed with ALS, his doctor told him that he would only have two years to live.
2. Hawking was known for his research on
Correct!Wrong!
Hawking was known for his research on black holes.
3. Hawking lived until the age of
Correct!Wrong!
Hawking lived until the age of 76.
Discussion/essay questions
Stephen Hawking once had a party for time travellers. He didn’t send the invitations out until the day after the party, so that only people from the future could show up. It was an experiment that was meant to show that time travel to the past was unlikely to be possible. Do you think that time travel could ever be possible? Why or why not?
Transcript
Stephen Hawking was an English physicist. He was born in 1942 in Oxford, England. Growing up, Hawking was always very interested in math and science, and at age 17, he decided to pursue a physics degree. However, at age 21, Hawking was diagnosed with ALS, a serious condition that weakens nerves and muscles. His doctor didn’t expect him to live more than two years after his diagnosis, but Hawking was determined to get his degree. He achieved his goal, and he is now well-known for his research on black holes. Throughout his life, he also published several books about the universe. His most famous book, titled A Brief History of Time, was written to help ordinary people understand complex scientific concepts. Hawking lived much longer than expected, but his condition worsened as his life went on. Eventually, he had to use a wheelchair to move around, and a speech synthesizer to communicate. Hawking died at the age of 76, after living a full and accomplished life.
The nozzles of a standard 3D printer contain liquid polymer.
2. A 3D printer creates an object by
Correct!Wrong!
A 3D printer creates an object by building up layers of polymer.
3. Scientists have used 3D printers to
Correct!Wrong!
Scientists have used 3D printers to make prosthetics.
Discussion/essay questions
As 3D printers become easier for people to access, they also become more dangerous. Many people have used 3D printers to make guns, knives, and other weapons. Should 3D printing be regulated to keep everyone safe? If so, what would be the best way to do this?
Transcript
A 3D printer is a device that is used to create objects from computer-generated models. 3D printers may seem like complex machines, but they are actually very similar to regular printers. A normal printer uses nozzles filled with ink to print words on paper. A standard 3D printer uses nozzles containing liquid polymer, a waxy substance that solidifies quickly. The machine receives instructions from a computer, and the nozzles follow these instructions. They print the object by building up thin layers of polymer from the bottom to the top. Although the average person might use a 3D printer to make something fun like a toy or figurine, this technology also has a lot of practical uses – especially in the medical field. Scientists have used 3D printers to make prosthetics for injured and disabled patients. This is important because 3D printing can often be much cheaper than other types of manufacturing.
1. The physicist who predicted the existence of antimatter was
Correct!Wrong!
The physicist who predicted the existence of antimatter was Paul Dirac.
2. An antiparticle is almost identical to a particle, except for its
Correct!Wrong!
An antiparticle is almost identical to a particle, except for its charge.
3. When particles and antiparticles come into contact, they
Correct!Wrong!
When particles and antiparticles come into contact, they destroy each other.
Discussion/essay questions
For years, scientists have debated the reason why our universe has more matter than antimatter. Some scientists have even suggested the idea that the Big Bang created another, parallel universe, made up mostly of antimatter. However, there isn’t a lot of evidence for this. Do you think scientists will ever know the answer to this question, or are there just some things about the universe we will never understand?
Transcript
In 1928, British physicist Paul Dirac predicted the existence of antimatter. His theory was that every type of subatomic particle had an antiparticle. He believed that an antiparticle would be almost identical to a normal particle, only with an opposite electrical charge. This theory was proven two years later, when American physicist Carl David Anderson discovered a positively-charged electron, later named the “positron”. Today, physicists know that our universe contains both matter and antimatter. They have even successfully created antimatter atoms. However, antimatter is still one of the greatest mysteries in the universe. Scientific theory states that the Big Bang should have created equal amounts of matter and antimatter. The problem with this idea is the fact that matter and antimatter instantly destroy each other when they come into contact. This means that if the Big Bang had created as much antimatter as it did matter, the universe would not exist today.
Curie moved to Paris for her degree because the University of Warsaw only admitted male students.
3. Curie was the first person to
Correct!Wrong!
Curie was the first person to win two Nobel Prizes.
Discussion/essay questions
While Marie Curie’s research did help scientists develop cancer treatments, her research was also important for the invention of the atomic bomb during World War II. The atomic bomb is still a controversial subject because of the amount of deaths it caused. Do you think Curie’s discoveries had a positive impact on the world, or a negative one?
Transcript
Marie Curie was a Polish-born French physicist, known for her research of radioactive chemicals. She was born in Warsaw, Poland in 1867, the youngest of five children in her family. Growing up, Curie was smart and curious, and dreamed of getting a university degree. However, the University of Warsaw only admitted male students at the time. In order to get her degree, Curie moved to Paris. She studied physics at Sorbonne University, and later received another degree in math. After her education, Curie went on to become a scientist. While working with a mineral known as pitchblende, Curie discovered a new chemical property, which we now know as radioactivity. She also discovered two new elements, which she called polonium and radium. Because of these scientific discoveries, Curie became the first person to ever win two Nobel Prizes. Curie died in 1934 from an illness caused by her exposure to radiation. However, her research has helped modern scientists develop treatments for cancer, and she is still seen as one of the greatest scientists of all time.
The idea of the Big Bang was first proposed by Georges Lemaître.
2. Edwin Hubble made the observation that
Correct!Wrong!
Edwin Hubble made the observation that galaxies were moving away from each other.
3. Lemaître's idea received criticism because
Correct!Wrong!
Lemaître's idea received criticism because most scientists believed that the universe had existed forever.
Discussion/essay questions
While most scientists today agree that the universe was created by a Big Bang, some have other theories. Do you believe that the Big Bang theory is the correct explanation? Why or why not?
Transcript
The Big Bang theory is a theory scientists use to explain the creation of the universe. The theory states that all of the matter in the universe began to expand from one single point. This idea was first proposed by astronomer Georges Lemaître in 1927. He received evidence to support his theory when another astronomer named Edwin Hubble observed that galaxies seemed to be moving away from each other. This was an indication that the universe was expanding. Because of this new information, Lemaître concluded that the universe must have once been smaller and denser. According to the theory, the universe began as something known as a singularity, which is an area where matter is infinitely dense. Over 13 billion years ago, this singularity began to expand, and the matter inside it formed atoms that would later form stars and planets. Lemaître’s idea received a lot of criticism, because most scientists at the time believed that the universe had existed forever. However, throughout the 20th century, scientists continued to find proof that Lemaître’s theory was accurate. Today, the Big Bang theory is the most widely accepted explanation for how the universe was created.
Einstein moved to the U.S. because he had to protect himself from the Nazis.
Discussion/essay questions
Some people wanted to use Einstein’s discoveries to develop weapons, such as the atomic bomb. What is your opinion on the use of new scientific discoveries to build stronger weapons?
Transcript
Albert Einstein was one of the most influential scientists of the 20th century. He was born in Germany in 1879, and he began attending school in 1885. As Einstein got older, he became fascinated with the nature of light. He wrote his first scientific paper at the age of 16, and later went on to study physics at a university in Switzerland. In 1905, Einstein published four scientific papers. The papers introduced his theory of special relativity, which allowed scientists to better understand the connection between time and space. Einstein won the Nobel Prize in 1921 for his achievements. In the 1930s, however, Einstein became a target of the Nazi Party of Germany. He moved to the U.S. to protect himself, and continued to work as a physicist. Einstein died in 1955, but his brain is still kept in the Princeton University Medical Center. Scientists still study it today.
