#609 When did people start eating chickens?
When did people start eating chickens? People have eaten chickens for thousands of years, but it only became cheap after World War […]
#608 How does a breathalyzer work?
How does a breathalyzer work? The alcohol in a person’s breath reacts with a solution, creating an electrical current. The breathalyzer relies […]
#607 Why can a Peregrine falcon fly so fast?
Why can a peregrine falcon fly so fast? Because of their wings, their feathers, their breastbone, their heart, their lungs, and a […]
#606 Why do cameras have mirrors?
Why do cameras have mirrors? To flip the image so that we can see it the right way up through the viewfinder. […]
#605 How can an eagle see so far?
How can an eagle see so far? Eagles can see about eight times farther than humans because the cones in their eyes […]
#604 Why is lead poisonous?
Why is lead poisonous? It settles in cells and interferes with many different enzymes, preventing the cells from working properly. Lead is […]
#603 How do people predict the weather?
How do people predict the weather? These days, by using AI and supercomputers. People have tried to predict the weather for millennia. […]
#602 How long did it take for the sun to get hot?
How long did it take for the sun to get hot? Approximately 10 million years for it to start burning. The sun […]
#601 When did oxygen appear on Earth?
When did oxygen appear on Earth? Oxygen appeared on Earth between 2.4 and 2.2 billion years ago. The air we breathe is […]
#600 What is a marsh and a swamp?
What is a marsh and a swamp? A marsh is a wetland on the edge of a lake or stream that is […]