This DIY ‘heart rate monitor’ will open your eyes to the amazing muscle that keeps you alive and kicking. All you need is a drinking straw and a lump of putty, plasticine or blu-tac.

What to do:

  1. Poke the straw into the putty. Okay, so it looks nothing like an expensive ECG monitor but wait till you see what this thing can do!
  2. Lay on your back and find the pulse in your neck. Lay the putty on top of this spot so that the tip of the straw is just above your eye. Now watch what happens… it’s a little freaky.

What is happening? The straw is moving in time with your beating heart.

How it works