How things work

The body & medicine

How blood flows and how medicines work. 5 works

Blood Circulation

Follow one drop of blood around the heart, the body and the lungs.
Keys and Locks

Watch molecules compete for the locks on a cell.
Half-Life and Drug Levels

Watch a made-up drug’s level halve, then pile up with repeated doses.
How Pain Relievers Work

Block the door of an enzyme factory and see what gets made less.
Antibiotics and Viruses

See why a drug can hit bacteria but not viruses, and how survivors take over.