How long does a 747’s runway need to be? A Boeing 747 airplane needs a runway that is at least 2,300 m long to land and over 3000 m to take off. However, this is a difficult question because there are many variables that come into play when determining the necessary length of runway for […]
#397 How long does a 747’s runway need to be? Read More »
How does caffeine stop you from feeling sleepy? Caffeine stops you from feeling sleepy by blocking the action of adenosine on its receptors. So, why do we get sleepy? A lot of research has been done into why we need to sleep, but nobody has come up with an answer. We obviously do because if
#396 How does caffeine stop you from feeling sleepy? Read More »
Why are rabbit ears so long? A rabbit has big ears to cool itself down, not just to hear predators. Rabbits are herbivores and are obviously preyed upon by various other animals. Their large ears can swivel independently and can pick up sounds from up to 3km away. They can turn each ear 270 degrees,
#395 Why are rabbit ears so long? Read More »
Why does drinking milk help after eating spicy food? Milk helps after eating spicy food such as chili because it contains something called casein. When you eat spicy food, the oily capsaicin molecules attach themselves to nerve receptors in your mouth. These receptors then release a protein called TRPV1, which alerts your brain to heat.
#394 Why does drinking milk help after eating spicy food? Read More »
Why do we get jet lag? We get jet lag because rapid travel puts our circadian rhythm out of sync with the local time. Jet lag is a fairly recent problem. In fact, the expression “jet lag” was only coined in 1966. The reason for this is that you have to be able to jump
#393 Why do we get jet lag? Read More »
Why are there many different types of screw head? The different types of screw head allow for different amounts of torque and for use by different machines. There are over 30 different types of screw head. Prehistoric people generally joined things together using adhesives. The earliest known adhesive was a tar made from heating birch
#392 Why are there many different types of screw head? Read More »
How does LiDAR help archaeologists? It can map the ground down to the millimeter, allowing archaeologists to find the remains of cities and graves that might otherwise remain hidden. LiDAR stands for Light Detection and Ranging. It is similar to sonar and radar, but it uses light instead of sound waves and radio waves. Sonar,
#391 How does LiDAR help archaeologists? Read More »
Why do mustard and wasabi make your nose hurt? Mustard and wasabi hurt your nose instead of your tongue and throat because the oil in them turns into a gas. Spices such as mustard and wasabi affect us in a very different way to chili. When you eat a spicy chili, the capsaicin in the
#390 Why do mustard and wasabi make your nose hurt? Read More »
Why are sunsets such beautiful colors? The beautiful colors of sunrises and sunsets are caused because light rays are scattered by particles in the sky. Light has different wavelengths and our eyes have evolved to detect these wavelengths, which is how we can see colors. Our eyes have a light-sensitive area which is sensitive to
#389 Why are sunsets such beautiful colors? Read More »
How do metal detectors work? Metal detectors work by transmitting an electromagnetic field that energizes any metal near it. There are three different types of metal detector and they all work in slightly different ways. These different types are very low frequency (VLF) detectors, pulse induction (PI) detectors, and beat-frequency oscillator (BFO) detectors. VLF detectors
#388 How do metal detectors work? Read More »
