How safe is your design using 8-mm bolts that yield at 0.5 MPa? That is, can you quantify the extra supplied cross-sectional area as a ratio called the factor of safety?

Blank liquids and gases exert a buoyant force on objects placed in them

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?