Part 1 of a two-part course:
Free Preview/Review on Isotopes and Half-life.
Tuesday, Dec. 19, 2023, 7-9 PM, via Zoom.
Open to members and non-members.
Dr. David Helfand, Columbia University
A refresher on atoms and radioactivity in preparation for his subsequent course,
The Universal Timekeepers: Reconstructing History Atom by Atom.
Tuesdays, Jan. 16 – Feb. 6, 2024.
• Register (no fee) for this class (Part 1) at
• Register separately for four subsequent classes (Part 2) starting Dec. 20