All posts by b6009997

Celebrating Marie Curie

Marie Curie was born 149 years ago today. We think she is one of the most inspiring female scientists as one of the first women to make an outstanding contribution to science. Her work overturned established ideas in physics and chemistry and helped overcome societal barriers for women.

Marie Sklodowska was born in Poland in 1867. In 1891 she went on to study physics and maths at Sorbonne University in Paris. She met Pierre Curie, professor of the School of Physics, who she married in 1895, becoming Marie Curie.

The Curies worked together investigating radioactivity, the process where atoms decay by emitting radiation. With help from other physicists they discovered new elements, polonium (named after her home country, Poland) and radium in 1898. This work was extremely difficult as they were constantly exposed to radioactive elements, which made them feel ill, an effect known as radiation sickness. They received the Nobel Peace Prize in Physics for their work in 1903. Marie Curie was the first woman to win a Nobel Prize.

Unfortunately, Pierre died from being knocked down by a carriage in 1906. Marie Curie took over his professor post and became the first woman to teach at Sorbonne University. She received a second Nobel Peace Prize in 1911 for her work in chemistry where she determined a way to measure radioactivity.

Her research was crucial in development of X-rays. Marie developed small mobile X-rays that were used in World War One to diagnose injuries. She worked with her daughter at the front line to help diagnose injuries.

Marie Curie died due to exposure to radioactivity during her work in 1934. The Marie Curie Hospital was opened in 1930, specialising in radiological treatment of women suffering from cancer. The Marie Curie charity was established in 1948 which now offers care, support and guidance for people with a terminal illness.

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The Chemistry of Being Scared

Happy Halloween! We all like being scared sometimes, whether it’s scary movies or a rollercoaster, but why do we get scared?

We feel fear when we see or hear something that makes us anticipate harm. If you are walking through a haunted house this Halloween and a skeleton jumps out at you, the skeleton is a stimulus that triggers a signal in your brain.

The hypothalamus is part of your brain that activates the ‘fight or flight’ response. When you are scared molecules of glutamate (a neurotransmitter) travel to the hypothalamus. This then triggers the autonomic nervous system, a response that you can’t control.

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Nerves from the brain carry impulses to glands which produce adrenaline, released into the blood. Adrenaline causes our heart rate and blood pressure to increase making us ready to run away quickly.

When we get scared we also get goosebumps. This is a trait that evolved in our hairier ancestors. When our hair stands up on end it makes us look bigger and more threatening to whoever is scaring us. This is seen in other animals too, such as cats.

However, we aren’t scared forever. Eventually our body realises that there is nothing to be worried about.  Sensory data of what we have seen and heard is sent to the hippocampus in the brain which can store and retrieve conscious memories. It gives context to what we have seen and asks questions such as have I seen this before and what happened last time?

If a skeleton jumps out, we will realise that it isn’t real and is probably just someone dressed up! The hippocampus will determine that there is no danger and sends a message to the hypothalamus. Adrenaline production stops and our heart rate goes back to normal.

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We have evolved to feel fear to allow us to survive. People and animals who feared the right things survived and passed on their genes. This makes sure we don’t do stupid things like picking up poisonous snakes or walking off buildings.

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9 Scientific Mistakes in Disney and Pixar

Sorry to crush your dreams but we have inspected some of our favourite Disney films and some things just don’t sit right in our scientific minds. Here are nine examples of what would really happen, according to science. But remember anything is possible in the world of Disney…

1. Finding Nemo

All clown fish are born male. Each group of clown fish has one female, the biggest fish. When the female dies, the biggest male fish will become female, this is know as being a sequential hermaphrodite.  When Nemo’s mother was killed by the barracuda, Marlin would have become female, leaving Nemo as the dominant male.

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2. The Lion King

Rafiki is introduced to us in the Lion King, where he performs Simba’s birth ceremony. He also sings a song in the film “Asante sana, squash banana, wewe nugu, mimi hapana”. This is a Swahili rhyme which translates to “Thank you very much (squash banana), you’re a baboon and I’m not!”. Rafiki doesn’t belong to any species, he is a cross between a mandrill and a baboon, he has the colourful nose and cheeks of a mandrill and the mane and long tail of a baboon.

3. Up

In the film Up, Carl ties thousands of balloons to his house to go on an adventure to South America. However, the number of balloons he uses are not enough to lift a house. Estimating that the house weighs 45,000 kg, you would need over 3 million balloons!

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4. Inside Out

Inside Out personifies five major emotions; Joy, Sadness, Fear, Anger and Disgust which all work together to guide and protect their human (Riley). However, there are actually six core emotions, with Disney missing out surprise. These six emotions are found to be universally recognized and expressed across the world, even in remote tribes that would not have learned the meaning of such facial expressions elsewhere.

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5. Tarzan

After baby Tarzan was left alone in the jungle to be raised by gorillas, he eventually grows up and meets Jane who teaches him to speak English. Unfortunately in the real world, no matter how great a teacher Jane was, Tarzan would never have been able to talk. Scientists have described a critical period up to the age of 5 which is vital for language development. If children, like Tarzan, aren’t exposed to a human language in this time they will be unable to learn to speak later in life.

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6. Aladdin

Aladdin and Jasmine travel from Cairo (Egypt) to Athens (Greece) in one second on the magic carpet, meaning they would have to travel at 621 miles per second! The air resistance would be 100 million times larger than their weight, causing them to burn up, like when meteors burn up when they enter our atmosphere.

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7. Star Wars

Star Wars is well know for its fights in space, full of explosions, blaster and engine sounds. However, space is a vacuum, meaning that it is devoid of matter, there are no gases or air there. Sound can’t travel in a vacuum, as sound vibrations don’t work, therefore we shouldn’t be able to hear any sound.

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8. The Good Dinosaur

In the good dinosaur, a young dinosaur by the name of Arlo befriends a human boy. Arlo is an Apatosaurus which lived around 151 million years ago. Human beings as we are or Homo sapiens only evolved between 200,000 to 100,000 years ago so in reality Arlo and his friend would have missed each other by quite a few million years.

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9. Finding Dory

When searching for Dory’s family in Finding Dory, we discover that Dory was born in captivity, in an aquarium. However, Dory is a species of fish known as the Blue Tang. This species can’t be bred in captivity and have to be caught from their wild home of coral reefs in the Indo-Pacific Sea.

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