The Above Photograph shows some of the attendees of the 1927 Solvay Conference ... Some of the finer scientific minds of the 20th and 19th century are shown ...
As now, here is another fascinating point in history!

SciShow:   Why do we have some of the organs/tissues we have?  View for "baby teeth"

Alice Ball  Leprosy Treatment Sci Show 

Covid-19:  Alton Brown Wash Your Hands

Covid-19:  5 Most Googled Questions

Electromagnetic Spectrum:  Why are plants green?

Rare Elements:  We're Running Out of These Elements

The Color of Autumn Leaves

Decomposition of 30% Hydrogen Peroxide (really cool)

Polymer Lab Everyday Chemistry.   

Bohr Model of the Atom / Spectrum

Physical Changes vs. Chemical Reactions

Amalgamation (Mercury and Aluminum)

Lonnie's Lab:  Making NaCl

Bonding:  Basics of Ionic and Covalent Bonding

Bonding:  Professor Dave Explains Bonding: Nonpolar Covalent, Polar Covalent

Electrochemistry Lab

The Weak Force of the Nucleus