What country was the first to go to the moon?
The first human-made object to reach the surface of the Moon was the Soviet Union's Luna 2 mission, on 13 September 1959. The United States' Apollo 11 was the first manned mission to land on the Moon, on 20 July 1969. Read Full Article
What does it mean to have 20 60 vision?
20/20 vision is your visual acuity, or the sharpness of vision at 20 feet from an object. Having 20/60 vision means that you must be at 20 feet to see what a person with normal vision can see at 60 feet.Read Full Article
Why are objects in the mirror closer?
Here's a case for saying that objects in the mirror are closer than they appear: The mirror is slightly convex so as to give the driver a wider field of view. As a result, the expanse of mirror reflecting light from the object into my eye is smaller than the expanse would be if the mirror were flat. Read Full Article
What are bones made up of?
Bone is made mostly of collagen, a protein that is woven into a flexible framework. Bone also contains calcium phosphate and calcium carbonate, minerals that add strength and harden the framework. The combination of calcium and collagen gives the bone its strength and flexibility. Read Full Article
Is light an energy?
Electromagnetic energy is the same as radiation or light energy. This type of kinetic energy can take the form of visible light waves, like the light from a candle or a light bulb, or invisible waves, like radio waves, microwaves, x-rays and gamma rays. Read Full Article