1. These know- it- alls, they're not Rainman- style savants sitting at home memorizing the phone book.

2. These know-it-alls, they're not Rainman-style savants sitting at home memorizing the phone book.

3. Allotropy is just polymorphism but for a pure element. It’s a great vocabulary word for know-it-alls to throw out when someone mentions polymorphism for an element.