David J. Helfand
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David J. Helfand's image of birth and death in the Milky Way

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   A mosaic of radio and infrared images of the Galaxy showing regions of stellar birth and death from the MAGPIS survey.

   
My new book is now available at

Columbia University Press
​  (20% off with code CUP20)
or
Amazon.com

"A lively and inviting introduction to the building blocks of everything we know, The Universal Timekeepers demonstrates the power of science to unveil the mysteries of unreachably remote times and places."

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If you are interested in learning about the science of Global Warming, check out my course on the subject for EdX -- lectures are available for free at:
   https://www.edx.org/course/fos4-climate-and-us


​And, an essential companion if you wish to escape from the world of "alternative facts":

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We live in the Information Age, with billions of bytes of data all just two swipes away. But how much of this is of value? How much is mis-, or even dis-information? Lots. And your search engine can’t tell the difference. As a result, an avalanche of misinformation threatens to overwhelm the rational discourse we so desperately need to address complex social problems such as climate change, the food and water crises, biodiversity collapse, and emerging threats to public health.  This book provides an inoculation against the misinformation epidemic by cultivating scientific habits of mind.  Anyone can do it — indeed, everyone must do it if our species is to long survive on this crowded and finite planet.
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