In early June, Brady travelled to New York on holiday.

But took the chance to visit some Periodic Table of Videos fans in New York state, at Barker Road Middle School.

Videos from the trip can be found at the PTOV website.

But here on Test Tube we have an exclusive video message that Professor Martyn Poliakoff recorded for the students.

We only included snippets of it in the main videos, but here's the mesage in its entirity for those who are interested.