I can’t explain the science, but I understand the power of love

The sound of footsteps thunders down the stairs. I hear it just in time to look right and see my 16-year-old son launching himself at me. He jumps with arms spread wide like a professional wrestler leaping from the top ropes onto a stunned opponent below. I cry, “Oomph!” as the air leaves my lungs on impact. But then his surprise attack turns into a lov…