Why are lemons sour when other fruits are sweet? Lemons are sour because they contain a lot of citric acid. We also need to remember that there are a huge variety of lemons, some very sour and some not so much. We need to break this question down into a few parts. Why does citric
#1842 Why are lemons sour when other fruits are sweet? Read More »
How did we discover stem cells? Stem cell were discovered by accident in the 1960s by James Till ad Ernest McCulloch. Despite the enormity of the discovery, they never won a Nobel Prize for it. Most cells in our bodies have a specific job. Skin cells, nerve cells, and liver cells all perform different functions.
#1841 How did we discover stem cells? Read More »
Why did we evolve to see the part of the light spectrum that we can see? We evolved to see the range of the light spectrum that we can see because it was the most available and easily detectable. If our planet had a different atmosphere and our sun was hotter or colder, we may
#1826 Why did we evolve to see the part of the light spectrum that we can see? Read More »
Why is tooth enamel so hard? Tooth enamel is so hard because it is made of about 96% minerals, which is more than anything else in the human body. Enamel is the thin layer that sits on top of our teeth. A tooth is made up of layers, and the job of enamel is to
#1801 Why is tooth enamel so hard? Read More »
What is Botox? Botox is a drug made from the toxin produced by the bacterium Clostridium botulinum. Its name comes from botulium toxin. We have most likely heard of Botox thanks to its role in plastic surgery, but there are several other uses for it as well. In plastic surgery, it is primarily used to
#1799 What is Botox? Read More »
Why don’t humans have whiskers? We probably lost our whiskers because, as our primate ancestors became increasingly reliant on vision and sensitive, manipulative hands, whiskers became less useful. Whiskers are found in most groups of mammals, although in some species they have become greatly reduced or disappeared completely. Humans are one of the mammals that
#1795 Why don’t humans have whiskers? Read More »
How did we discover DNA? DNA was first discovered in 1869, but it wasn’t identified as the substance carrying hereditary information until 1944, and its structure wasn’t discovered until 1953. DNA stands for deoxyribonucleic acid. Broken down, “deoxyribo” refers to the sugar part of the DNA, “nucleic” means it is found within the nucleus of
#1786 How did we discover DNA? Read More »
Why do beans cause gas? Beans cause gas because of the complex sugars and fiber that they contain. Beans are the seeds produced by plants in the legume family. A lot of them are edible, but not all of them. Humans cultivate and make use of many different kinds of beans. Beans are seeds, but
#1769 Why do beans cause gas? Read More »
What is rabbit starvation? Rabbit starvation is what can happen when a person eats almost nothing except very lean meat for a prolonged period. A person can feel full, but still become malnourished because the diet is extremely high in protein and extremely low in fat and carbohydrates. The name “rabbit starvation” comes from rabbit
#1765 What is rabbit starvation? Read More »
How did we discover blood types? Blood types were discovered by Karl Landsteiner in 1900. Humans have four blood types. We have A, B, AB, and O. They are further divided into positive and negative, giving 8 different blood types. The positive and negative refer to the Rh antigen. If you have it, you are
#1745 How did we discover blood types? Read More »
