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Physical science is the study of matter, energy, and the interactions between them. Physical science display ideas are ways to showcase the concepts and phenomena of physical science in a creative and engaging way. Here are some possible physical science display ideas for you:

– Electricity and Magnetism: You can demonstrate the principles of electricity and magnetism by creating circuits, electromagnets, motors, generators, speakers, and more. You can use wires, batteries, magnets, light bulbs, coils, and other materials to make your display interactive and fun. You can also explain how electricity and magnetism are related, and how they are used in everyday devices.
– Sound and Light: You can explore the properties of sound and light by making musical instruments, optical illusions, kaleidoscopes, prisms, mirrors, lenses, and more. You can use different materials to show how sound and light travel, reflect, refract, diffract, interfere, and change frequency and wavelength. You can also explain how sound and light are forms of energy, and how they are used for communication and entertainment.
– Forces and Motion: You can investigate the effects of forces and motion by building rockets, cars, planes, catapults, pendulums, roller coasters, and more. You can use different materials to show how forces and motion depend on mass, speed, direction, gravity, friction, air resistance, and other factors. You can also explain how forces and motion are related to Newton’s laws, and how they are used in transportation and engineering.
– Chemical Reactions: You can demonstrate the changes that occur during chemical reactions by making volcanoes, slime, crystals, soap, baking soda and vinegar, and more. You can use different substances to show how chemical reactions involve the rearrangement of atoms, the release or absorption of energy, and the formation of new products. You can also explain how chemical reactions are involved in cooking, cleaning, medicine, and other applications.

These are some examples of physical science display ideas that you can try. You can also combine different topics and experiment with different materials to create your own unique display. Physical science display ideas are a great way to learn about the natural world and express your creativity. Have fun! ??

Here’s a brief history of the Global GDP.

The concept of Gross Domestic Product (GDP) was first developed by Simon Kuznets in 1934 for a U.S. Congress report . GDP is the sum of gross value added by all resident producers in the country plus any product taxes and minus any subsidies not included in the value of the products . It is calculated without making deductions for depreciation of fabricated assets or for depletion and degradation of natural resources .

According to the World Bank and Maddison, GDP is gross domestic product converted to international dollars using purchasing power parity rates . An international dollar has the same purchasing power over GDP as the U.S. dollar has in the United States .

The following table shows the world GDP over the last two millennia :

| Year | World GDP (2017 international dollars) |
|———-|——————————————-|
| 1 | 1.2 billion |
| 1000 | 1.2 billion |
| 1500 | 1.4 billion |
| 1600 | 2.2 billion |
| 1700 | 2.7 billion |
| 1820 | 1.2 trillion |
| 1870 | 2.7 trillion |
| 1913 | 6.6 trillion |
| 1950 | 15.7 trillion |
| 1973 | 36.5 trillion |
| 1998 | 44.2 trillion |
| 2015 | 119.0 trillion |

As we can see, the world GDP has grown exponentially over the years. In 1 AD, the world GDP was 1.2 billion international dollars, which increased to 119.0 trillion international dollars in 2015 . The world GDP has grown by more than 100 times in the last 2000 years .