A Proposal and a Popsicle Stick Cross (S02E20)

S02E01 A High-Pitched Buzz and Training Wheels S02E02 A Rival Prodigy and Sir Isaac Neutron S02E03 A Crisis of Faith and Octopus Aliens S02E04 A Financial Secret and Fish Sauce S02E05 A Research Study and Czechoslovakian Wedding Pastries S02E06 Seven Deadly Sins and a Small Carl Sagan S02E07 Carbon Dating and a Stuffed Raccoon S02E08 An 8-Bit Princess and a Flat Tire Genius S02E09 Family Dynamics and a Red Fiero S02E10 A Stunted Childhood and a Can of Fancy Mixed Nuts S02E11 A Race of Superhumans and a Letter to Alf S02E12 A Tummy Ache and a Whale of a Metaphor S02E13 A Nuclear Reactor and a Boy Called Lovely S02E14 David, Goliath and a Yoo-hoo from the Back S02E15 A Math Emergency and Perky Palms S02E16 A Loaf of Bread and a Grand Old Flag S02E17 Albert Einstein and the Story of Another Mary S02E18 A Perfect Score and a Bunsen Burner Marshmallow S02E19 A Political Campaign and a Candy Land Cheater S02E20 A Proposal and a Popsicle Stick Cross S02E21 A Broken Heart and a Crock Monster S02E22 A Swedish Science Thing and the Equation for Toast