What is dark matter??

Explanation:

Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241×10−27 kg/m3. ... Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet undiscovered subatomic particles.

God to do a cool down after working out.  hope this .      cheers!

Answer (6) six inches of the floor;