How can we 3D print organs? Organs can be 3D printed using an ink made of the patient’s own cells that are laid on a scaffold. One of the problems we have as humans is that our organs sometimes fail. There are many reasons for this, from disease to accidents. Some organs we can live […]
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Why do rechargeable batteries lose power as they age? Because the process of recharging a battery is not 100% efficient and because of chemical degradation. These days, the majority of us use rechargeable batteries every day. While writing this, I have four devices currently recharging. I am sure you have something similar while you are
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Why does soap produce foam? All foaming soaps contain chemicals that are called foaming agents. As their name implies, their job is to make a foam when you add water and air to the soap. The main chemicals that you find in soap are ammonium lauryl sulfate and sodium dodecyl sulfate. Both of these are
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What is the difference between volts, amps, ohms, and watts? Volts measure the difference in electrical force between two points. Amps measure the flow of electricity. Ohms measure the resistance of the material. Watts measure electrical power. The volt is named after Alessandro Volta, who built the first electric battery. Volta lived from 1745 to
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What causes acid rain? Acid rain happens when water molecules in the atmosphere encounter sulfur dioxide or nitrogen oxide. Acid rain was a big problem in the USA and European countries during the 1980s and 1990s, but we don’t hear so much about it anymore. Has the problem been solved, or has it just shifted
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How does carbon dating work? Carbon dating allows scientists to estimate the age of something by counting the number of carbon-14 atoms that are left. Carbon-14 is created in our atmosphere and is absorbed by all living organisms. It is created when cosmic rays impact nitrogen atoms in our atmosphere. A cosmic ray is a
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How quickly does your blood regenerate after you donate it? The blood volume will be back in 48 hours, but it will take four to eight weeks for the red blood cells to regrow. When people donate blood, they usually give about 450 ml, which is about a pint. Depending on your size, that is
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What is a superconductor? It is a state of matter for a material where there is zero resistance to electricity. We need to start by looking at what electrical resistance is. Electrical resistance is, rather obviously, a resistance to the flow of electricity. An electric current results when electrons flow from an area with a
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Why does entropy happen? Entropy happens because there are vastly more ways a system can be in disorder than it can be in order. Entropy is explained in the second law of thermodynamics. It says that the state of entropy of an isolated system will always increase over time. It has been rewritten since it
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Why is carbon dioxide the main greenhouse gas? Carbon dioxide is the main greenhouse gas because it absorbs more heat than other gases. When we think of greenhouse gases and climate change, we think of carbon dioxide, but it is not the only greenhouse gas. All of these gases are obviously produced naturally, but human
#1050 Why is carbon dioxide the main greenhouse gas? Read More »
