Poison arrows and pufferfish

Poison ivy, poison oak, and poison sumac.

Poison Romance and Poison Mysteries

Generalized Arrows

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Genome size evolution in pufferfish: a comparative analysis of diodontid and tetraodontid pufferfish genomes.

Smooth pufferfish of the family Tetraodontidae have the smallest vertebrate genomes yet measured. They have a haploid genome size of approximately 400 million bp (Mb), which is almost eight times smaller than the human genome. Given that spiny pufferfish from the sister family Diodontidae and a fish from the outgroup Molidae have genomes twice as large as smooth puffers, it appears that the gen...

Arrows and Exact Sequences

The above is a plaisanterie by Henri Cartan (1952 in an Oberwolfach meeting). It was not meant seriously; most mathematicians agree that number theory is the queen of mathematics. But it shows that, at that time, many people working in topology, algebra and related fields were greatly impressed by the impact and power of that simple quite new idea; it was able to facilitate arguments and intuit...