What is a digital TV signal amplifier?
Before 2009, televisions in the United States could receive analog TV signals, but now only digital signals are used and …
Science
What were the first animals to walk the earth?
A euticarcinoid fossil from Blackberry Hill, Wisconsin. According to research published in 2012, the first footprints on land were the …
What is hydrated silica?
Hydrated silica, which is used in many toothpastes. Hydrated silica consists of the chemical compound silicon dioxide in a form …
What are the stages of mitosis?
The stages of mitosis. There are five stages of mitosis: prophase, prometaphase, metaphase, anaphase and telophase. The phases were identified …
What is a proton?
Protons can be found in the nucleus of all atoms. A proton is a subatomic particle found in the nucleus …
How does the sense of smell work?
The nose passes scent information to the olfactory cortex of the brain. The sense of smell, known as smell, uses …
What is air ionization?
Negative ion therapy can help relieve symptoms of seasonal affective disorder (SAD) and other mood disorders. Ionization is the process …
What are some common microscopic animals?
Three Paramecium caudatum. Microscopic animals are animals too small to be seen with the naked eye. Microorganisms such as bacteria …
What is silicon?
Silicon combines with oxygen and takes the form of sand. Silicon is an abundant non-metallic element found throughout the universe. …
What is a torsion spring?
Torsion springs are commonly used in mouse traps. A torsion spring is a device used to support and dampen movement …