Do You Know
Questions & Answers on General Knowledge.
What is lichen?
Thought to be among the oldest living things on Earth, lichen is a unique growth that is made up of a fungus and either green algae or bacteria called cyanobacteria. The algae or bacteria live underneath the sheltering fungus, and provide it with sugars (food) from photosynthesis. In return, they receive protection from the sunlight and are able to live without drying out. In this way, lichen represents one of the most unique living "partnerships" on Earth. Lichen is a hardy plant that grows on all kinds of bare surfaces in extreme environments, such as rocks, tree trunks, desert sand, cleared soil, and living bark. Most kinds grow very slowly—often less than 1 millimeter per year.
What exactly are gravity waves and how are they measured?
How do elephants use their trunks?
How do bones grow?
Would it be possible to determine the consolidation of particles like polymer powders using a light spectrum? How?
Will the dinosaurs ever come back?
Are bones hard as a rock?
What is the corona?
Which ocean is also known as the Southern Ocean?
Why is the element mercury a liquid at room temperature when none of its neighbors on the periodic table are?
How can microwaves heat something? Radio waves don't warm things very much.
When was the motor car made?
Do all plants have leaves?
Why do people put salt on icy sidewalks in the winter?
How can you demonstrate that sounds are waves produced by the vibration of material objects?
Which was the first reptile?
Which is the largest of all oceans?
How did the poem “Mary Had a Little Lamb” become so famous?
How are African elephants different from Asian elephants?
What is a rift valley?
Do animals ever carry seeds?
I enjoy watching the pole-vaulters at the Olympics, especially Daly Thompson. Could you explain the physics of the pole vault for me?
Which is the biggest monitor lizard?
In a microwave oven, does food cook from the inside out or outside in?
If I don’t have a thermometer handy, can I count cricket chirps to calculate the temperature outside?
What is gravitational force?
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