List 10 things you know to be absolutely certain.

- The sun will rise in the east and set in the west every day.
- The sum of the interior angles of a triangle is always 180 degrees.
- Water boils at 100 degrees Celsius at sea level.
- The force of gravity makes objects fall toward the Earth.
- Every whole number is either even or odd.
- All humans require food, water, and air to survive.
- The Earth orbits the sun.
- Two parallel lines will never intersect.
- Change is an inevitable part of life.
- 2 + 2 equals 4.
M.A.D.