Time flows in both forward and backward directions.

The frequency of visible light is inversely proportional to its wavelength.  

All elements have a stable isotope

Water expands when heated at all temperatures.

All isotopes of an element have the same chemical properties.

The SI unit of energy is Newton.

The atomic number of an element can be changed by gaining or losing electrons.

Temperature measures the total energy of a substance.

Lifting a book increases its kinetic energy.

Energy can be destroyed but not created.