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Dec 19

A Free Preview/Review of Chemistry, Isotopes, and Half-life

December 19 @ 8:00 AM - 5:00 PM EST


Preview/Review of  Chemistry, Atoms and Half-life

Tuesday, Dec. 19, 2023, 7-9 PM, via Zoom.


Dr. David Helfand of Columbia University will review basic chemistry, including the half-life of radioactive atoms. This will serve as a preview for his subsequent four-session class, The Universal Timekeepers: Reconstructing History Atom by Atom.

This subsequent course explores how we use radioactive isotopes as cosmic clocks, a key tool in all sciences including cosmology. This course is an elaboration of a public AAA lecture Dr. Helfand gave in 2019. Its title is also the title of his just-released book. A description and registration for this separate “Universal Timekeepers” course will soon be posted on this “Classes” page at AAA.org.

PART ONE – THIS FREE CLASS   – Tuesday/ Dec. 19
“Preview Review” of chemistry, atoms, and half-life.

PART TWO – FOUR  CLASSES($50 tuition) – Tuesdays/Jan. 16, 23, 30, Feb. 6
Using atoms as universal clocks, even back to the Big Bang.

We invite you to the free Dec. 19 “Preview Review” class to help you decide if you wish to go deeper and register for the subsequent classes. Please join us.

• Register now (no fee) for this Dec. 19 class at XXXXxxxxxxxxxxxxxxxxxxxxx

                • Register for the subsequent classes afterwards, around Dec. 21 


December 19
8:00 AM - 5:00 PM EST
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