Possible Clues:

• Toy in an egg
• Toy in a plastic egg
• Toy introduced in 1950
• Stretchable toy in a plastic egg
• Toy that astronauts brought to space to secure tools in zero gravity
• School glue + borax + water
• Modeling material stored in an egg
• Pliable plaything
• Toy kept in plastic eggs
• Toy sold in eggs