What is solar energy?
Solar energyis light and heat that comes from the sun.
The rays of light and beams of heat from the sun contain energy that can be changed into electricity through a device called a solar cell or solar panel. Solar cells are made of a material that absorbs energy from the sun. Once it is inside of the cell, the energy breaks up into electrons and protons. Electrons have a negative charge, and protons have a positive charge. All the negative charges are attracted to one side of the solar cell, and the positive charges are attracted to the other side. When the solar cell is connected through wires to a light bulb, for example, it works like a battery, and electrons flow through the wire. This brings electrical energy to the light bulb, which makes it light up.
Is there a difference between a weatherman and a meteorologist?
Although a weatherman and a meteorologist both deal with predicting weather conditions, they are two completely different kinds of professionals.
A meteorologist is a scientist with an education degree related to atmospheric science or meteorology. Meteorologists are able to make a professional forecast based on computerized weather information and scientific analysis. A weatherman, on the other hand, does not need the advanced knowledge that a meteorologist has in order to perform his job, as what a weatherman does is report the weather based on the information calculated by a meteorologist. A weatherman usually has a degree in journalism and needs to be able to speak well and to perform well in front of an audience or a radio microphone while reporting on the weather.
How do teeth get cavities?
Dental cavities are holes in the two outer layers of a tooth, called the enamel and the dentin. The enamel is the outermost, white, hard surface, and the dentin is the layer just beneath the enamel. Both layers serve to protect the inner, living tooth tissue, called the pulp, where there are blood vessels and nerves.
There are certain types of bacteria in your mouth that multiply when you consume sweet food, eventually becoming plaque. Plaque is a mixture of bacteria and saliva that forms a filmy, sticky coating on your teeth.
If the plaque that forms on the teeth is not removed (which is done by simply brushing your teeth with a toothbrush), the plaque produces acid. This acid dissolves the minerals that make the tooth enamel hard. When this happens, the surface of the enamel eventually becomes porous, and tiny holes appear. After a while, the acid causes the tiny holes in the enamel to get larger, until one big hole appears. This is a cavity.
Why do we shiver when we are cold?
We shiver in an effort to keep ourselves warm.The human body needs to stay at a temperature of 98.6 degrees Fahrenheit. When you feel cold, tiny sensors in your skin send messages to your brain. In an attempt to avoid hypothermia (where the body temperature drops to dangerous levels), your brain sends messages to nerves all over your body, telling your muscles to tighten and loosen really fast in order to generate heat. This type of muscle movement is what we call shivering.
Shivering when we’re cold is just one of the ways our body works to maintain itself. The human body has many incredible systems that help keep it running smoothly. Our body has homeostatic functions, the automatic monitoring, adjusting, and regulating of our vital systems that happen without us even knowing it. Besides shivering, which helps regulate body temperature, some examples of homeostatic functions include breathing and heart rate.
Question of the Month:
This month’s question was submitted by Rachel L. from Brooklyn, NY
Q: Dear Professor, Why do comets have names?
A: Dear Rachel, Comets are named for the people who discover them. Halley’s Comet, for example, was named for English astronomer Edmond Halley.
Professor Noe Ital’s New Book,
“Exploring the Wisdom & Wonders of the Universe with Professor Noe Ital”
is now available at your local Judaica store and on Amazon.com