We all would not be here without her positivity. PROTON is also part of the Atomic 3-pack and Everyday Matter 6-pack.
Breaking news! On 16 July 2010, scientists discovered that the Proton is now 4% smaller!
Approximately 5 oz (142 gm) grams; 4.5 inches (12 cm) across.
For ages 5 and up as it contains glued-on/small parts.