Do You Know
Questions & Answers on General Knowledge.
What are ferns?
Ferns are an ancient group of plants that first appeared on Earth about 325 million years ago. They are most closely related to mosses and liverworts. There are more than 12,000 species of ferns that grow around the world, and many live in moist, shady, tropical regions such as rain forests. Ferns are called vascular plants because they have internal vein structures that help spread water and nutrients throughout the plant. Ferns do not have flowers or fruit. They reproduce by spores, microscopic dustlike particles that are released by the hundreds and spread by wind and water. They are typically produced on the lower side of the fronds or "leaves." When released, each spore grows into a tiny heart-shaped structure called the thallus, Which makes male sperm cells at the pointed end and female cells in the notch. After a heavy rainfall, the sperm burst free from the thallus and swim to the female cells, where they are fertilized.
How do projection or rear projection televisions work?
What is a supernova?
Is hydroplaning a form of sliding friction?
Why is a severe snowstorm called a “blizzard”?
What is the world’s largest number?
Why is stainless steel a sterile material? Why is it used for surgical tools and to pierce ears?
What is an orbit?
How does an internal combustion engine work?
How can you travel across Alaska’s miles of snow?
Why do koalas live only in Australia?
What was unique about the maiasaura?
What is a raptor's gizzard?
What is stress?
What were the first musical instruments?
What was the profession of A. B. Strowger, the inventor of the Step by Step Switching System?
How do you calculate how much weight a helium balloon can lift?
What should I do if I find a gun?
What is the principle of the Trinitron Sony TV system?
What makes heat rise?
How does a car horn work?
What were some of the earliest steam- and gasoline-driven vehicles?
How does a transistor amplify an input signal in an audio amplifier?
Where did the customs of Halloween come from?
How big are sharks?
How does electricity work and is it possible to design a light bulb that will let you know when it is about to stop working?
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