Zach’s facts have been extracted from the book to remind you of the key concepts you and Zach have learned in each chapter.

Zach's Facts 1.1 Scientific statements

• Scientific statements are ones that can be verified with reference to evidence. For example, ‘Alice and I will stay together longer than the average couple’ is testable: we can measure the average length of time a couple stays together, and we can (eventually) measure the amount of time that Alice and I stay together (it will be forever!).
   
• Non-scientific statements are ones that cannot be tested empirically. For example, ‘Alice and I are the perfect couple’ would be non-scientific because it is probably impossible to define what a ‘perfect couple’ is, so we couldn’t measure it.