Tommy’s heart aches and he needs minor surgery to mend it. Before you sharpen your scalpel, you have to make sure that you operate on the correct organ. Where is Tommy’s heart?
Think of the best car engine you can imagine – if you kept it running non-stop, it wouldn’t be long before something broke. Your “engine” is much more impressive: during your entire life, the heart never takes a break – and that’s at an average of 115,000 beats per day!
