observation and inference discovery

All living things are composed of one or more cells. We know this because every living thing examined to date has been found to be composed of one or more cells.

If you break a mirror, you will have seven years of bad luck.

The earth is flat. Anybody can see that!

Taking Vitamin C prevents the common cold. Linus Pauling, a scientist who discovered the structure of vitamin C, says it does.

The rate of acceleration of all falling objects on Earth is constant. 2 spheres of identical diameter and volume are dropped from the top of a building; one is made of steel, the other made of plastic. They both will accelerate at the same rate (32ft/sec) and hit the ground at the same time.