A man for all seasons: Sagan speaking as an anti-nuclear advocate at the Great Peace March in 198... more A man for all seasons: Sagan speaking as an anti-nuclear advocate at the Great Peace March in 1986. Life on Mars: a Martian 'petrophage', inspired by Sagan and Joshua Lederberg's assessments preceding the Viking mission to Mars.
In our original paper [Phys. Rev. Applied 6, 014017 (2016)], we considered electric power generat... more In our original paper [Phys. Rev. Applied 6, 014017 (2016)], we considered electric power generation from Earth's rotation through its own magnetic field. Jeener claims to prove that no such effect is possible [Phys. Rev. Applied 13, 028001 (2020)]. But this conclusion results from a failure to recognize a distinction between the corotation with Earth of the nonaxially symmetric components of Earth's magnetic field and the nonrotation with Earth of the axially symmetric components. We use Earth's geomagnetic field to demonstrate the important consequences of this distinction. Because the distinction has considerable empirical support, Jeener's argument is likely incorrect.
... the ordinary. For this reason, preparing for biological terrorism has more in common with con... more ... the ordinary. For this reason, preparing for biological terrorism has more in common with confronting the threat of emerging infectious diseases than with preparing for chemical or nuclear attacks. Defence against bioterrorism ...
Over the past quarter century, our understanding of the impact history of the Solar System has gr... more Over the past quarter century, our understanding of the impact history of the Solar System has greatly improved. This chapter considers how this increased knowledge affects our evaluation of the chances for other intelligent communicative civilizations in the Galaxy. In addition, the role of impacts is examined for insight into the long-standing debate over whether the evolution of technical intelligence is contingent upon extremely special circumstances, or might instead be a likely outcome of many different but parallel evolutionary pathways.
A man for all seasons: Sagan speaking as an anti-nuclear advocate at the Great Peace March in 198... more A man for all seasons: Sagan speaking as an anti-nuclear advocate at the Great Peace March in 1986. Life on Mars: a Martian 'petrophage', inspired by Sagan and Joshua Lederberg's assessments preceding the Viking mission to Mars.
In our original paper [Phys. Rev. Applied 6, 014017 (2016)], we considered electric power generat... more In our original paper [Phys. Rev. Applied 6, 014017 (2016)], we considered electric power generation from Earth's rotation through its own magnetic field. Jeener claims to prove that no such effect is possible [Phys. Rev. Applied 13, 028001 (2020)]. But this conclusion results from a failure to recognize a distinction between the corotation with Earth of the nonaxially symmetric components of Earth's magnetic field and the nonrotation with Earth of the axially symmetric components. We use Earth's geomagnetic field to demonstrate the important consequences of this distinction. Because the distinction has considerable empirical support, Jeener's argument is likely incorrect.
... the ordinary. For this reason, preparing for biological terrorism has more in common with con... more ... the ordinary. For this reason, preparing for biological terrorism has more in common with confronting the threat of emerging infectious diseases than with preparing for chemical or nuclear attacks. Defence against bioterrorism ...
Over the past quarter century, our understanding of the impact history of the Solar System has gr... more Over the past quarter century, our understanding of the impact history of the Solar System has greatly improved. This chapter considers how this increased knowledge affects our evaluation of the chances for other intelligent communicative civilizations in the Galaxy. In addition, the role of impacts is examined for insight into the long-standing debate over whether the evolution of technical intelligence is contingent upon extremely special circumstances, or might instead be a likely outcome of many different but parallel evolutionary pathways.
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Papers by Chris Chyba