For those of you like me, with a limited education that certainly never covered physics,
here is an interesting link to a demonstrated talk about crystal structures made 61 years ago at Bell Laboratories in the US.
The segment presumes no educated background in the topic and is both interesting and easy to follow.
www. youtube.com/ watch?v=_YW0wjYdUPworatories in the US.
Just close the gaps and copy the address.
