Definition: Science helps us
understand the workings of
the universe and everything in
it. We increase our knowledge
by observing, experimenting,
and testing theories.
Why do
objects
sitting in water
seem distorted
at the surface?
Find out on page 241How do we get
electricity from
solar panels? Find out
on page 231SCIENCEEinstein’s famous equation E=mc
2
explains that energy and matter are the same thing.The Earth’s climate is changing as a result of carbon dioxide produced by human activity.
The instructions to make you are carried on about 25,000 genes in the DNA of your cells.
In 1514 Copernicus was the first to show that the Earth moves around the Sun.
Sound travels at a speed of 740 mph (1,190 km/h) through dry air that is 32°F (0°C).