Penny: I always tear up when the Grinchs heart grows three sizes. Sheldon: Tears seem appropriate. Enlargement of the heart muscle, or hypertrophic cardiomyopathy, is a serious disease which can lead to congestive heart failure.
How to blow up a balloon with alka seltzer
This would also work with light green balloons to illustrate the Grinch's heart growing! ;)
Christmas Science - Grow the Grinch's Heart
Grow the Grinch's heart with this fun Christmas science activity based on this favorite book. It's a STEM activity with a Christmas twist.
"The Grinch's heart is two sizes too small! You can help the Grinch's heart grow when you are kind, hard-working, and polite. Every good deed equals another heart for the Grinch." For siblings in December!