BlufGrandma
Considering how many are on that list, you've picked suspiciously few, my dear.
My nan talks like that, maybe you two are friends?
Here's a task for you grandma: how many on the list are structural engineers, what %? how many have had their theory published in academic peer review journals to ensure reliability?
Some have defined themselves as physicists, physics is a broad subject, it does not means they are experts in all sub categories of physics, such as structural engineering which is what is required in regards to explaining the tower collapse.
An I.T expert may have some knowledge of programming, but he's not an expert in programming, a programmer is. Programming is a category within I.T, and so is networking, so is web design.
Come on grandma, you have to ask yourself why so many on the list are not even physicists. Once you've done that, ask yourself why you needed to adopt Parky's grandma character "my dear".